Cryonics costs time and money. The burden of proof is there. If I'm completely ignorant of what it would be like, then I will not spend any effort to bring it about. Byrnema said it well; let the resources be expended on a baby rather than on me.

I would kind of like to try LSD, because I know something about that, and what I've heard is mostly positive, when following certain guidelines. A random unknown hallucinogen would pose a danger of long-term health effects. So let hallucinogen X be one whose safety is guaranteed but whose other effects I'm completely ignorant of. Then I don't care that I've never tried hallucinogen X. I am not going to spend time and money seeking it out.