OP you logic doesn't make sense.  The slowest miner is going to take the highest fees.  If a miner solves the block they get the block reward (subsidy + all fees) if they don't then they don't.  There is no scenario where it makes sense to NOT take the highest fees and go for the lowest fees.  From the largest TH/s miners down to the single processor miners, if it is economical to mine it makes no sense to do anything other than take the highest fee tx first.