Put simply - because the market is not hugely over-inflated at this point by an abundance of uneducated investment. What goes up, must come down and this year boy did it come down.
It did come down so hard that most of us either got burned already and decided to leave or continue to stick in this market and wait till 2020. I do hope that those inexperienced traders and investors learn a lot from the disaster of 2018.
We need some news to really re-ignite the market once more, maybe the bakkt bitcoin future offering will do. We need more time and see what will be the decision though, so lets just stay positive or at the bright side, accumulate when the price is still cheap.