If you buy a bitcoin in the price of 9000$, yes it may drop, but we have clearly seen that this is what it does. It goes up and down. If you have 1 million dollars and buy 100BTC (900.000$) then the only thing you have to do is wait. Because someday it will pass that number and you will have profit. Am I wrong?
Bitcoin is not consistent. Sometimes the price of it gets low and if you are lucky it gets high. There people who are afraid in investing in bitcoin because they did not if they will get a profit or the will bankrupt. That's why bitcoin is a risk taking situation.