Most of the people who joined the crypto community at the later part of 2017, especially December were not any real crypto investors. They just heard about the booming prices and decided to join and also make profit. They don't know the potentials of the blockchain technology and the future it holds and that is why now that prices are down, they have all left the market and its left the real crypto enthusiasts. They are those who are seriously doing panic selling over the markets
Can say that people are staying with this market are really people who love cryptocurreny and blockchian technology and really understand them. Maybe they have also lost so much year ago but their belief doesn't still change