Assuming you meant for the comment section to be used to convince you. Not necessarily because you meant it, but because making that assumption means not willfully acting against your wishes on what normally would be a trivial issue that holds no real preference for you. Maybe it would be better to do it with private messages, maybe not. There's a general ambient utility to just making the argument here, so there shouldn't be any fault in doing so.
Since this is a real-world issue rather than a simple matter of crunching numbers, what you're really asking for here isn't merely to be convinced, but to be happy with whatever decision you make. Ten months worth of payment for the relief of not having to pay an entirely useless cost every month, and whatever more immediate utility will accompany that "extra" 50$/month. If 50$ doesn't buy much immediate utility for you, then a compelling argument needs to encompass in-depth discussion of trivial things. It would mean having to know precise information about what you actually value. Or at the very least, an accurate heuristic about how you feel about trivial decisions. As it stands, you feel the 50$/month investment is worth it for a very narrow type of investment: Cryonics.
This is simply restating the knowns in a particular format, but it emphasizes what the core argument needs to be here: Either that the investment harbors even less utility than 50$/month can buy, or that there are clearly superior investments you can make at the same price.
Awareness of just how severely confirmation bias exists in the brain (despite any tactics you might suspect would uproot it) should readily show that convincing you that there are better investments to make (and therefore to stop making this particular investment) is the route most likely to produce payment. Of course, this undermines the nature of the challenge: A reason to not invest at all.
Background:
On the most recent LessWrong readership survey, I assigned a probability of 0.30 on the cryonics question. I had previously been persuaded to sign up for cryonics by reading the sequences, but this thread and particularly this comment lowered my estimate of the chances of cryonics working considerably. Also relevant from the same thread was ciphergoth's comment:
Based on this, I think there's a substantial chance that there's information out there that would convince me that the folks who dismiss cryonics as pseudoscience are essentially correct, that the right answer to the survey question was epsilon. I've seen what seem like convincing objections to cryonics, and it seems possible that an expanded version of those arguments, with full references and replies to pro-cryonics arguments, would convince me. Or someone could just go to the trouble of showing that a large majority of cryobiologists really do think cryopreserved people are information-theoretically dead.
However, it's not clear to me how well worth my time it is to seek out such information. It seems coming up with decisive information would be hard, especially since e.g. ciphergoth has put a lot of energy into trying to figure out what the experts think about cryonics and come away without a clear answer. And part of the reason I signed up for cryonics in the first place is because it doesn't cost me much: the largest component is the life insurance for funding, only $50 / month.
So I've decided to put a bounty on being persuaded to cancel my cryonics subscription. If no one succeeds in convincing me, it costs me nothing, and if someone does succeed in convincing me the cost is less than the cost of being signed up for cryonics for a year. And yes, I'm aware that providing one-sided financial incentives like this requires me to take the fact that I've done this into account when evaluating anti-cryonics arguments, and apply extra scrutiny to them.
Note that there are several issues that ultimately go in to whether you should sign up for cryonics (the neuroscience / evaluation of current technology, estimate of the probability of a "good" future, various philosophical issues), I anticipate the greatest chance of being persuaded from scientific arguments. In particular, I find questions about personal identity and consciousness of uploads made from preserved brains confusing, but think there are very few people in the world, if any, who are likely to have much chance of getting me un-confused about those issues. The offer is blind to the exact nature of the arguments given, but I mostly foresee being persuaded by the neuroscience arguments.
And of course, I'm happy to listen to people tell me why the anti-cryonics arguments are wrong and I should stay signed up for cryonics. There's just no prize for doing so.