People are invested in bitcoin in many ways.
They see good reasons to stick with it and most of them are thinking long term.
Things crash from time to time, it doesnt mean they are dead.
And besides that profit isn't the main focus for most of the old dogs of bitcoin.
Bitcoins today is still profitable, the price in the market might go down but still there is a huge chance for its price to grow again because the market is volatile and we can use its volatility in order to earn more profit.