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.
Actually, many people invested in bitcoin in a lot of reasons. The main reason why people keep on buying bitcoin is the opportunity to become rich or millionaire. In addition to that, bitcoin is very profitable so that many people keep on buying it.