Calling those people idiots is not the right thing. As all of us know that the bitcoin price is rising continuously. It just that those people believe in Bitcoin's potential and may able to manage the risk.
Definitely, those people have some sound future planning. An ordinary person with lower financial sources can't do that kind of dare. Maybe they are investors, high net worth individuals, big companies, and traders who want to get profits in a short time or for the long term.