People spend time in bitcoin because it is an opportunity to earn in a fastest and easy way. It was proven by many people that there is a profit in bitcoin and others become rich through it. And i believe people doesn't think bitcoin as a waste of time rather a great opportunity to earn.
Spending time in bitcoin is not a waste for me cause bitcoin gives me money to support my family needs and working in bitcoin gives me opportunity to become successful and it's proven by many investors become rich through it. Spending time in bitcoin is profitable cause I see how it works in the market.