Bitcoin makes many people go crazy, illiterate investors invest when they grow, while others buy Bitcoin during the fall and are waiting for their growth. We ourselves have made with this a cult of wealth and easy prey and turned it all into a boom 
I think that many people attract to bitcoin because they see that bitcoin can give some value to them and I see that in December is the top of the number of people who buy bitcoin and it continues until now. they see that bitcoin reach the highest price again although today the price is in under $10k, they still have a hope that the price can reach the highest price again in the future and it caused the boom in bitcoin. maybe we are going to see another boom again once the bitcoin price can reach more than $15k.