I use crypto currency exclusively for the purpose of making money on speculation. I do not believe in them as a means of payment, since coins have too high volatility. And the state will not allow it.
Good answer... And honest.
Add me to that list. As far as I'm concerned, I care less about all the altcoins (maybe except for XMR and LTC), but I do care about BTC somewhat. But what really got me in the space was to speculate, then I guess learning new stuff was nice too. But again... I came here to trade, speculate and gamble.