How feasible is it for a large mining operation to artificially keep gas fees high?

I'm aware that bitcoin miners can prioritize specific txids. If this is possible on ethereum, it occured to me that by prioritizing their own high gas spam transactions to their own wallets, a large mining pool or similar could set an artificially high market rate for gas and use expected block rewards and transaction fees paid by legitimate users to more than make up for anything lost to blocks mined by other pools. How feasible is this scenario?