Also, if the pokerrooms don't like the Sharks winning all the time why do they offer better bonuses and comps to the Sharks? Because they are the players they want. They end up playing higher stake tables, reach the rake
cap more often and play hands faster thus generating more hands per hour.
Fishes slow it down by deliberating over their cards and more of them staying in a hand that they shouldn't which means less hands per hour.
Sharks generate more rake.