total fees should not be the sole factor that determines which transactions a miner includes in a block.

the long term health of the network should also be considered.

getting paid to fill blocks full of jpegs, while exclusing actual economic transactions, may be lucrative in the short term, but if it harms the network over the long term, those higher fees may end up being worthless.

miners, like all other users of the system, have a vested interest in protecting the long term health of the network.

treating the network as a jpeg storage engine is antithetical to this end.