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From the help docs:
Can I sell my credits to other members?
Yes. While we do not "buy back" credits ourselves, you are free to sell your extra credits to other members or give them away. You may set the price and payment method. Please note that there is a limit of 50 credits/month for credit transfers between members (this limit does NOT apply to Friends of PBS or other donations, credit transfers to or from Games Moderators, or credits given using the Give Refund button).
To offer your credits for sale:
To obtain payment:
After you have been paid by the purchasers for the credits:
There is also a limit of transfers to the CD and DVD sites. I'm not sure what it is, but have heard from members who have hit their limit. Not sure if it is monthly or total limit. Just know there is one.