You're wrong in almost every way, and even though your post is essentially flaming rhetoric and fails to address anything in the linked-to post or make any substantive claims at all, I'll still try to make a few points just because I have to at least say something.
Cryonics was definitely a scam when the first organization was established.
I've listened to some of the founders talk about what it was like when they first started. They were a small group of people who righteously believed in their cause, but had no money or organization. They pulled together in many amazing ways, at one point having to keep someone on ice in someone's bathtub before they could get a real solution, and winning amazing and unprecedented legal victories by pulling together and fighting for their cause. This is the sort of story I've heard. What are you even referring to? Or is your opinion just some random crap you pulled out of your ass which has no relation to reality (which is what I suspect)?
very much unlikely to provide any significant life extension
If you want to argue it's a bad bet, fine. I would disagree, but your free to have your own opinion.
The cryopreservation process causes significant brain damage, due to ischemia, cryoprotectant toxicity, mechanical stress caused by thermal contraction and possibly ice formation (its unclear whether they can achieve full vitrification of a human brain).
How much damage does burial or cremation cause?
Even if the process was in principle capable of preserving enough information to restore the self, there are significant chances that they may not perform it properly, since it entails difficult and time-critical procedures, and they work without any independent oversight and clearly have no incentive to report errors and mishaps.
The implication being that the folks running cryonics organization are frauds just out to make money and don't give a damn about the patient? Another baseless and insulting accusation.
Even if the preservation process works in principle and they performed it correctly, there are no known or even realistically foreseable technologies that would allow restoration. Belief in magical nanotechnology is just blind faith.
There is nothing magical about the prospects of nanotechnology. There are no assumptions that we will discover free energy, cold fusion, or need anything that we know violates the laws of physics. If you're not going to point out exactly what is magical about widely held beliefs about the prospects of future technology then it's safe to assume this is yet another opinion pulled out of your ass.
Even if restoration technology becomes available, it is far from obvious that future people will have an incentive to restore cryopreserved people, particularly at large scale.
The continued existence of cryonics organizations with their current policies provides for reanimation. In addition there are many perpetual trusts that provide redundant mechanisms for insuring reanimation is provided for. Finally, what exactly does this say about your view of humanity? If you had a stable but preserved medical patient, and came up with a way to cure them, would you save their life, or just throw people away like garbage? If the latter, what the hell is wrong with you? Most people would not do that. Also see http://alcor.org/FAQs/faq07.html#today
Last but not least, the financial structure of cryonics organization is dubious, resembling Ponzi/pyramid schemes. The long-term viability of these organizations is questionable.
Do you even know what a pyramid or Ponzi scheme is? A cryonics organization charges people the money required to perform the services they offer. They are very open about their financials. And yeah, the long-term viability of anything is questionable, but personally I don't believe the long-term viability of everything is certainly doomed.
Just going to add to this, there are lot of complete made up stories defaming cryonics organizations which have been found fraudulent in court. I don't know what the hell is wrong with people that would make them want to do this, I'm guessing maybe religious nuts who want to scare people away.
Saw this on reddit.
http://www.reddit.com/r/atheism/comments/ydsy5/reddit_help_me_find_some_peace_in_dying_young_im/
I couldn't help be moved by this. I felt a very strong sense that she is one of us, whoever "us" is. Looking at some of the negative comments and worst of all bad arguments people are using as reasons not to donate made me more upset.
I hope some here might join me in dismantling them. I'd also encourage those like me for who this buys a lot of warm fuzzies to donate. Though it might be wise to wait until we hear from CI or some other third party on the matter.
Edit: She has since made a comment on LW! The provided information has made me pretty much certain that this is a genuine plight.
redditors where willing to give her money to go skydiving, they don't want to give her money to buy cryonics. Sometimes I can only weep.
I think it pretty clear that promoting efficient charity in that particular thread is very unlikely to result in people giving money to better causes. Also I just plain want her to be rewarded in some small way! Note the part starting in the second paragraph that I bolded, not only did she realized what she really was, but she stepped over the entire set of pro-death rationalizations and faced the social pressure people she loved exerted on her because they think she might go to heaven ... its not her fault that a few cells in her brain went haywire before she could afford an insurance policy, I just don't want people like that not having something to show after getting so much stuff right.
2n Edit:
For anyone who just realized the universe sucks and wishes to do something about that whole people dying thing, they are welcome to engage in some optimal death defeating philanthropy by donating to The Brain Preservation Prize that has been endorsed by both Robin Hanson and Eliezer Yudkowsky.