David -
Here's a suggestion.
1) Pick a charity. (I vote St Jude's)
2) Have members that want to participate list the cards in the B/S/T auction section with a common end date and **Charity Auction** note in the title.
3) Once the transaction is complete with each listing have the seller send one person the money.
4) Have the collector of the funds make the one contribution to the charity.
Even if participation is limited it's something and doesn't infringe upon anyone that doesn't want to participate.
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