Are you talking about the what to do to get cryopreserved, or just to do good in general?
Your donations alone aren't going to advance cryopreservation by much. Advancing it by half a second would save a life, but it's not going to be your life.
To do good in general, and possibly get cryopreserved depending on the outcome and time the research will take.
It's true, my donations alone wouldn't advance cryopreservation much. It's also true that the two pounds a month I pay to the NSPCC doesn't do much to prevent cruelty to children, but I'm not the only contributor. Providing enough people contribute to the cause cryopreservation would be advanced a good deal. It's like game theory, it's better for everyone to contribute to improving cryopreservation than cryopreserve themselves with current technol...
I know celebrities cryocrastinate just as much as anyone else, but King seems like the kind of guy to go through with it.
http://www.cnn.com/2011/12/02/showbiz/larry-king-i-want-to-be-frozen/index.html?hpt=hp_t3