Instead of introducing the premium charge which was a PR disaster, why don't Betfair just close unprofitable accounts and scrap the premium charge.
Then why not reduce commission rates for the smalltime punters (who bet less than £100 per week) to 0%. Then do everything possible to cross sell the high margin arcade games to these same punters.
Betfair need to copy the traditional bookmakers who ban the sharks and get the fish playing the FOBT's and all the other high margin stuff.
Imagine the adverts then. No middle man, no commission and 40% better prices. Very simple for the layman to understand.