The demand of bitcoin is based on the chance to become rich. And that's just because lot of people already did it.

Since the last bump when it hit $20,000 it become a global thing, it got the eyes of every one on it, was the star on the markets. And what happen after the crash? more people want it because some of them are sure it will hit more than $20k this year. If you but now at 11500 and sell at 20000, there is some profit on that move.