If your don't want to be frozen and want to do something useful with your money.
If you care about preserving yourself, spread your genes or memes is a more effective way
Spreading your memes for money is known as advertising. Not particularly cheap or effective. Didn't hear about anything similar for genes. These two are much better done by investing your own time and your own effort.
Of the remaining important things that money can buy, I think cryogenics is a very decent gamble.
