eBay, Selling, Buying and Issues.

[Auke]

Plus, as a seller you cannot warn other sellers, since you cannot leave feedback if you have opened an unpaid item case:

Sorry, it's not possible to leave feedback for this transaction. Feedback has been disabled because payment was not recorded.

Ridiculous.

And finally, eBay says that they record the unpaid item on the buyer's account, but that's not visible to other sellers and buyers, just eBay staff, so that's effectively useless...