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I'm afraid your offer is a bit low. There have been several people offering 5-7 poshpoints per PBS credit. I don't know if anyone has taken them up on it. I haven't seen any offers going the other way on either site.
If you find someone willing to take you up on that--let me know. I've got..25 PP I think, and 40 more on the way, and would gladly trade them all at 1:1 (or even 2pp:1 PBS).