This is the first I'm hearing of this, but it sounds like eBay will soon begin pulling listings with references to the BidPay payment system. My understanding is that using the BidPay logo, using a phrase such as "pay me with BidPay," etc., can get a listing removed with no warning.
Apparently, BidPay went tits-up on Dec. 31, so I guess the eBay folks have a point: it really isn't a payment option any longer.
More details:
http://auctionbytes.com/cab/abn/y06/m02/i02/s01
+++++
Read to the end for a good laugh: thousands of people still use "Billpoint" in their listings ... and Billpoint shut down two years ago.