Quote Originally Posted by Ole
But if he uses the same pictures next time, I might consider warning potential buyers...
And if those "potential buyers" (i.e. people who have placed a bid) report your contact to eBay, you may be suspended for auction interference.

Take the refund. As for feedback, if you don't do any selling on the ID you won the auction on, feel free to make your statement with a negative feedback. A retaliatory neg won't affect your ability to bid.