What do you think?

I have had my photos used by others on at least three occasions I can recall offhand. I suspect there are more as these are just ones I came across by chance.

The way I handle it is to just send a polite, ribbing email like 'Guess you liked that photo, eh? :)'.

I don't really strongly mind it, but I guess each time I felt like something subtly dishonest had gone on, since the item listed had now been used by the new owner for at least some period before his listing. In other words, though the item might indeed have still looked just the same, the photo being used was now 'old'.

I had a friend who had that problem with match.com...

That's funny Paul. Made me laugh.
Oregon and I are at peace with each other.

I now realize it was a mistake to use Muzikat's photo. As I stated before, his item sold, so the issue of competing with him did not exist.
My apologies.
Personally, I don't care if you use my photos to sell your items (Virgos posted at the moment- excellent speakers, but crappy photos!) Of course, if you used my photos to commit fraud, I'd take action.
It's the sheer pettiness from the pseudo moralists that I find so amusing.