Zorgman, my philosphy is this concerning that type of behavior of a sponsor: If they have close your account because of your trial retention, screw them! They are not worthed ! Once a surfer join their trial site, it's their FUCKING BLOODY job to retain them and make them signed up for the monthly sub.. It's just plain bullshit that sponsor dumb the responsability of their conversion INSIDE their own sites, to the webmaster that brought them the trial surfer. Frankly, how lame is that !
Webmaster can filter the traffic all they wants, but once inside a trial site, no webmaster can be accountable for the behavior of that given surfer. I would guess that PB has just very lame websites and marketing, if they can't retain their own surfer. On our part we have already the responsability to attract the surfer, make it signed the trial or full membership, and find the appropriate strategy to do so. It doesn't mean that once inside a sponsor site, the sponsor isn't obliged to the same, quite the contrary. If he fails on his side, it's his fault in my book.
Don't worry Zorgman, ask any sponsor rep. here, who want 1000 uniques clicks to their sites, and you will be properly spammed

. i am sure you can find better than PB, that won't be hard, i guess...