I have been had too by betfair. Not that my Pokerchamps network was that big, but still a couple of hundred dollars in commissions every month that was lost when they migrated players from pokerchamps to Betfair. Been in contact with several betfair representives (lately Oliver Scott), but they manage to shelve the case time and time again! I know some old champs affiliate have managed to get commission on old champs players migrated to Betfair so they have clearly just tried to shave what ever affiliates they could shave and just complied in some cases where they might lose future business or aff. that would make too much noise.
Even the big and wellestablished operators act like pirates sometimes.