Perhaps you shouldn't. That said, it is recommended by Eliezer Yudkowsky, and his words often weigh quite heavily here.
I don't necessarily agree that lacking experimental verifiability means that we shouldn't take something into account when making decisions, if we have enough reasons to think that it's true nevertheless.
Arguments from authority are equally ill advised :)
By the way you will find that Mr. Yudkowsky's positions are not held by everyone here.
Wait But Why published an article on cryonics:
http://waitbutwhy.com/2016/03/cryonics.html