Just because that's what Alcor is asking for does not mean that they can actually deliver the service they promise for that amount. Frankly, I don't think any

Just because that's what Alcor is asking for does not mean that they can actually deliver the service they promise for that amount. Frankly, I don't think any fixed amount is sufficient for a reasonable chance of a positive outcome. A lot can happen in a few hundred years. If you believe they are honest and competent (which I do), there are factors to consider entirely beyond their control. Even if we assume that there are still humans around to run Alcor, that energy prices haven't skyrocketed, that cryonics haven't been made illegal for some reason, and that some kind of war or natural or man-made disaster hasn't wiped out the facility, there's still a rather high chance that some future management of Alcor will be either dishonest or incompetent and ruin the whole thing. On a 200 year scale, I'd place the odds of that alone above 90%, even if I assume maximally effective present management. Again, this doesn't have any effect on the present benefits (hope, etc).