I'm guessing most of the answers here are from home miners.
If you have something like this, you have no choice but to sell your mined BTC soon as you get them to cover electrical and cooling costs:

Perhaps thats the question he's asking "Can you big guys hold your coins for a better price and personally eat the electrical costs untill that better price, or do you have to sell them"
I don't think many miners are going to want to mine bitcoin and then not sell "until they can get a better price". If they were to do this then they would simply spend the money they would give to the electric company on buying bitcoin on an exchange