Gotta go with Mike on this, I'd much rather have a gold eagle in my pocket than a bitcoin in a virtual wallet.
Understood that cryptos have already made some millionaires, and more will be made, but most of the big money made has been by people getting in at the bottom, much like buying WalMart @$1.50.
I am interested in learning about crypto currencies, it's part of the reason I joined Steemit, (make some friends and generate some steem) but I don't intend on trading dollars for cryptos any time soon.
I've also drawn comparison of the current crypto craze and the tulip mania. I don't know what was going on at the time that led up to the tulip mania but remember reading that at it's peak a single tulip bulb was selling for the equivalent of 10 years salary of a skilled craftsman.
I think the cryptos are the wave of the future, but in the present I'll continue stacking.