Tl;dr: Cryonics companies have a pre-written bottom line. If people believe cryonics has a reasonable chance of success, they are significantly morally obligated to form a charity that would give cryonics away, as such a charity would be far more effective in convincing, and by extension saving people, since it would have no incentive to pre-write a bottom line. Over time, such a charity would increase general demand for cryonics, bringing it into the mainstream and making traditional cryonics companies more successful.
Let us assume for the purposes of this post, as I'm sure many of you believe, cryonics stands a reasonable chance (Let's pick p = 0.05) of being successful. It seems pretty clear that you have a pretty strong moral obligation to attempt to get people signed up for cryonics. There is a lot of talk about things like Cryonics versus charity. Robin Hanson even has a post "Cryonics as Charity", although he means an entirely different thing than I do. But in searching, I was surprised not to find a post that asked this question: why isn't there a charity that provides cryonics to, for example, people that can't afford it? Or one offering it to the greatest minds of our time, in the hopes that they'll be around for all of our futures?
There's been a lot of speculation as to why cryonics isn't more popular. The answer, at least for me, is obvious. There's a tremendous dearth of reliable information on the subject. The fundamental problem with medicine is the information gap between consumer and provider - consumers don't have the scientific knowledge to make an informed purchase. But in conventional medicine, you can easily get a second opinion, whereas in cryonics, few people, from the media to medical professionals, take it seriously enough to offer a well thought out second opinion, even if that opinion is against it. And what information I have seen linked to on the subject is generally published by CI or Alcor. Ironically, when I asked for "unbiased" information on the matter, I got exactly what I wasn't looking for - information from a company that wants me to pay them, at minimum, $200,000. The result? An informational balance where one side presents no argument, and the other side presents an argument with a pre-written bottom line.
This is where the idea of a charity comes in. A charity would have no financial incentive to pre-write the bottom line, and is generally seen as a more reputable source of information, as it should be. Furthermore, it would help destigmatize cryonics, as part of the stigma (as I see it, I can't really tell you what gives me this impression) is that you've been "hoodwinked" by the companies. Obviously, it's not tenable for everyone to freeload their way to cryonics. But a charity would serve to bring cryonics into the mainstream and increase demand, providing a (more) neutral source of information. Which would, in time, make organizations like CI and Alcor far more popular.