Since religion promises eternal life, and a large number of respected scientists are religious, I assume that you are Christian, right? Also Muslim? And maybe Jewish?
If something is agreed to have a chance of extending my life for thousands of years by more than 5% of people whose thinking I respect and
Check
it costs less than 200k and
Check
there are no obvious people who are profiting from this then
Check
This is at least as true for religion (which you can practice for free) as it is for cryonics (which is a business venture).
I want to be >99% sure about it not being viable before giving up on it.
In what way can you be >99% sure that religion is not viable? What logic allows you to believe in cryonics but not religion, given that each have basically the same scientific underpinnings (which is to say, none at all).
EDIT: Unless you meant that the logic you described was not yours, but just mmaro's, in which case fair enough.
The logic he described belonged to no one. Neither he nor mmaro actually claimed it. It was an entirely hypothetical scenario in which some people might see mmaro's statements as something other than selling snake oil (I certainly wouldn't, it still wouldn't amount to "evidence" of any sort, just more fuzzy hope).
He hasn't made that argument or anything close to it. The most he's said/implied is that $50/month is worth it. If he has some other logic, he'll need to share it if he hopes to convince anyone. Otherwise, he's just a guy standing on the sidewalk with a bottle of magic pills.
Perhaps the logic is:
* If something is agreed to have a chance of extending my life for thousands of years by more than 5% of people whose thinking I respect and
* it costs less than 200k and
* there are no obvious people who are profiting from this then
* I want to be >99% sure about it not being viable before giving up on it.