individual users with home asics dont have a say in which transactions are added so its not miners demands. its pool manager greed/effect
Miners' demands are analogous to the profit. It really doesn't hold water for a pool manager to not want profit, so he sort of follows what miners want as well.
miners wants dont come into it
for decade most pools just gave shares of the block reward to miners.. and miners then demand value on the spot market by refusing to sell at les than their cost
pool managers kept the fee total
thus pool managers choose the transactions and take the fee's and miners have nothing to do with transaction choosing