OK, I think it is a good strategy.
But 90% seems to me too much.
We don't know the future and bitcoin has a lot of mighty ennemies (states, central banks, politicians, etc...).
Imagine what you will do if all of a sudden 1BTC= 0$
I view 75% as a maximum.
Personnality I am more carefull and stay around 50%, with gold, real estate and cash for other 50%.
well, yeah. that would be even better, but unless there's a legal way to roll my capital gains into another asset, I'd have to pay a huge tax penalty. and it's hard to imagine a scenario that would cause a crash to zero barring a new tech that cracks the encryption. the closer BTC comes to zero, the more attractive it is to guys like me who want to buy low.