I once spent a good 4 bloody hours trying to submit an auction. It finally worked with a LOT of editing and tweaking. In the end I got it to look the same as the original, but I had to move a lot of code around. I haven't had this problem recently.

Better than porn is changing your images to TEXT that says the seller is involved in a SCAM. Just say exactly what's being done.

Of course, this still takes up bandwidth from your site. If you don't care about bandwidth except for protecting your rights, just make the image HUGE. Come to think of it, you could always make an enormous gif which woulnd't take up too much space but would play havoc with the guy's layout.

Bruno