Assumptions

You are assuming that people don't know about cryonics, rather than that they know about it, but don't opt for it. I doubt this is true, as certainly most people have at least heard about cryonics. I think the main problem is that, the minute they go to investigate it, they see a lot of amateurish, unprofessional and unethical behavior. I think it's unreasonable to expect the general public to believe that people with little-to-no education in the medical sciences, can perform successful cryogenic preservations. Of course, we don't know how much damage can be repaired, in the future, but I believe a lot more people would sign up, if they knew real medical professionals, using real medical equipment, were going to perform the procedures. I believe cryogenic procedures are a logical extension of existing hypothermic medical procedures. However, for as long as a bunch of layman whose educations consist of 12 weeks of EMT-basic school, with no subsequent experiences other than a few practice runs with a pig, my answer to signing up is still, "Thanks, but no thanks."

If well-funded organizations like Alcor and Suspended Animation would quit playing around and hire some professionals, I believe more people would sign up. Both those organizations can afford to hire professionals, yet they continue to pay laymen salaries in excess of those earned by medical professionals. In addition, there's a whole lot of man-hours that neither I, nor anyone I know working in cryonics, can justify. In other words, a couple dozen people are getting paid a whole lot of money, on a weekly basis, to accomplish very little, and no one seems to give a damn. My guess is, they plan to keep it that way, for as long as possible.