Bitcoin is just like any other coin. The price goes up and down. So selling a bitcoin when the its price goes up is a stupid decision? I dont think that that is a stupid decision. It is a great opportunity for you to sell your bitcoin in those time cause you can get big benefits from it. It can give you a huge amount of money especially if you know how to sell it at a right time. So if youre saying that its stupid to sell bitcoin, i think your idea is the one that is stupid.