Cryonics scales very well. People who argue from the perspective that cryonics is costly are probably not aware of this fact. Even assuming you needed to come up with the lump sum all at once rather than steadily pay into life insurance, the fact is that most people would be able to afford it if most people wanted it. There are some basic physical reasons why this is the case.
So long as you keep the shape constant, for any given container the surface area is based on a square law while the volume is calculated as a cube law. For example with a simple cube shaped object, one side squared times 6 is the surface area; one side cubed is the volume. Spheres, domes, and cylinders are just more efficient variants on this theme. For any constant shape, if volume is multiplied by 1000, surface area only goes up by 100 times.
Surface area is where heat gains entry. Thus if you have a huge container holding cryogenic goods (humans in this case) it costs less per unit volume (human) than is the case with a smaller container that is equally well insulated. A way to understand why this works is to realize that you only have to insulate and cool the outside edge -- the inside does not collect any new heat. In short, by multiplying by a thousand patients, you can have a tenth of the thermal transfer to overcome per patient with no change in r-value.
But you aren't limited to using equal thickness of insulation. You can use thicker insulation, but get a much smaller proportional effect on total surface area when you use bigger container volumes. Imagine the difference between a marble sized freezer and a house-sized freezer. What happens when you add an extra foot of insulation to the surface of each? Surface area is impacted much as diameter is -- i.e. more significantly in the case of the smaller freezer than the larger one. The outer edge of the insulation is where it begins collecting heat. With a truly gigantic freezer, you could add an entire meter (or more) of insulation without it having a significant proportional impact on surface area, compared to how much surface area it already has. (This is one reason cheaper materials can be used to construct large tanks -- they can be applied in thicker layers.)
Another factor to take into account is that liquid nitrogen, the super-cheap coolant used by cryonics facilities around the world, is vastly cheaper (more than a factor of 10) when purchased in huge quantities of several tons. The scaling factors for storage tanks and high-capacity tanker trucks are a big part of the reason for this. CI has used bulk purchasing as a mechanism for getting their prices down to $100 per patient per year for their newer tanks. They are actually storing 3,000 gallons of the stuff and using it slowly over time, which implies there is a boiloff rate associated with the 3,000 gallon tank in addition to the tanks.
The conclusion I get from this is that there is a very strong self-interested case (as well as the altruistic case) to be made for the promotion of megascale cryonics towards the mainstream, as opposed to small independently run units for a few of us die-hard futurists. People who say they won't sign up for cost reasons may actually (if they are sincere) be reachable at a later date. To deal with such people's objections and make sure they remain reachable, it might be smart to get them to agree with some particular hypothetical price point at which they would feel it is justified. In large enough quantities, it is conceivable that indefinite storage costs would be as low as $50 per person, or 50 cents per year.
That is much cheaper than saving a life any other way. Of course there's still the risk that it might not work. However, given a sufficient chance of it working it could still be morally superior to other life saving strategies that cost more money. It also has inherent ecological advantages over other forms of life-saving in that it temporarily reduces the active population, giving the environment a chance to recover and green tech more time to take hold so that they can be supported sustainably and comfortably. And we might consider the advent of life-health extension in the future to be a reason to think it a qualitatively better form of life-saving.
Note: This article only looks directly at cooling energy costs; construction and ongoing maintenance do not necessarily scale as dramatically. The same goes for stabilization (which I view as a separate though indispensable enterprise). Both of these do have obvious scaling factors however. Other issues to consider are defense and reliability. Given the large storage mass involved, preventing temperature fluctuations without being at the exact boiling temperature of LN2 is feasible; it could be both highly failsafe and use the ideal cryonics temperature of -135C rather than the -196C that LN2 boiloff as a temperature regulation mechanism requires. Feel free to raise further issues in the comments.
Well, the "nothing response" had links, and included actual facts.
As a general rule of thumb, in any online forum that uses a karma system, remarks which are polite and well written are more likely to be voted up. Remarks which are insulting or seem to be quickly typed up with little thought are more likely to be downvoted. Now, there's also a general trend that comments which agree with the general attitude in a forum are more likely to be voted up than comments which do not. All these details apply to LW. Although LW prides itself on trying to be rational, and one could argue that comments which agree with the consensus here are simply more likely to be rational, I suspect that some amount of simply agreeing with what someone is saying does lead to upvoting. However, this seems to be less of a problem at LW than elsewhere (especially compare say Slashdot and Reddit). Now, there's one other aspect that's very important, the two factors (agreement with status quo, and quality of post) don't combine in a nicely linear fashion. In particular, comments which do not seem well thought out or indicate a lack of knowledge about a topic and which go against the status quo consensus are likely to be voted down a lot.
In that regard, your repeated use of the phrase "corpse popsicles" was apparently an indication of an attempt at emotionalism, something which really doesn't go over well at LW. Moreover, it also demonstrates a lack of detailed familiarity with cryonics since one would otherwise know that the standard derogatory pourmanteau is "corpsicle" rather than the long phrase "corpse popsicle." (I'm under the tentative impression that this is actually a pourmanteau of corpse and icicle)
This is the sort of thing that is probably getting you voted down. It wasn't at all clear (and after rereading what you've wrote still isn't at all clear) why you discredit that source. It might help for you to state what exactly in that link you object to.
Note that comments that discuss potential problems with cryonics are not in general downvoted. For example, my comment here was not downvoted (granted a single upvote isn't much but the point is clear).
In general when posting a comment in an environment which does not by and large support your view it is extremely important to make a comment as polite and well-reasoned as you can. Directly insulting the people one is addressing may make one feel good, but it is unlikely to actually change anyone's opinion. Moreover, it is the sort of thing which generally causes bystanders and audiences to not favor your opinion. This will likely still be true for otherwise pretty rational individuals. And judging from your remarks here and in previous posts on LW you seem to have a low opinion of the general level of rationality here. If you are correct in that assessment then it is even more important that you don't trigger hostile emotions in the people you are trying to convince.