Anybody that has that kind of gain in the last few years from Bitcoin et al., would be nuts to not be cashing some of it out. More and more headlines by the day are sounding like a rehash of the dotcom bubble type insanity that occurred right before the crash. The lifestyle difference between $300m and $800m, or $1b and $6b, is not meaningful enough to risk giving 50% or 97% of it all back in a serious crypto crash.

In my opinion, the crypto boom will follow a nearly identical path to most bubbles that involve new, valuable technology. The bust will last for several years, most coins & ICOs will end up entirely worthless, a select few will remain very valuable, and the new technology services (that touch the real economy) built on top of blockchain in the following 10-20 years is where all the lasting wealth & impact will be made (trillions of dollars in new wealth globally, due to productivity improvements from new services/products, affecting most aspects of commerce & economy eventually). Most of the bubble wealth created in the present crypto mania, will never get cashed out (can never be cashed out), it'll die in the fire as with all bubbles. It's the classic over-done splurge that you see with all new technology (try every possible permutation, along with 37 copies of each), it simply means 99% of the coins will vaporize.