I would think that most people that bought after 10k, only purchased smaller amounts of btc (lots of these ppl), While the remaining volume belongs to whales that manipulate the price. Obviously the whales sold it off as they are mostly in here to make profit by trading. I dont think to many ppl hold after the drop at 12k, (ofcourse except the long term hodlers that got in pre 2017 (under 3k))