Your statement is entirely contradictory: "They don't normally hold" and "They will sell more now". You can't have it both ways. I suggest you re-examine your logic/biases to ensure your thought process is at least internally consistent.
Selling cheap is a race to the bottom that puts you out of business. If businesses are not making a profit selling cheap... they will sell at a higher price, or hold until the price rises.
TBH, this is just another proof point that we are oversold.
Where is the contradiction? When miners have huge profit margins, they can begin speculating with those. Normally, profit margins are not huge, but currently they still are.
"Selling cheap" or "selling expensively" is nothing of concern for a miner. Their job is to sell periodically to cover their bills and pocket a small profit, they aren't speculators.
I'm describing just this progression.