I think one of the things Poker Player is saying is that as time progresses, the other forum (or forums) will eventually start increasing payouts in the campaigns that are being promoted on them especially as they will be driven by a policy that allows mixers to be visible (and posted about) and will results in mixers competing with each other thus the inevitable payment battle.
How many members would disagree with a principal that as traffic grows on the other forums, their campaign payouts will too, that is part of what Poker Player is stating and it is difficult to argue against that point.
If altcoinstalks want to make people move from bitcointalk to their website, they have to invest money into signature campaigns and make them artificially pay higher than others pay on Bitcointalk for a long period of time because they don't have traffic and can't gain a competitive advantage in traffic by simply offering $45 campaigns.