Using another's photos is inconsiderate, at best, so I understand how it might be frustrating.
On the other hand, I actually give my buyers full permission to use any/all photos I take of their item(s) for future use (e.g., if reselling, etc.), stated right in my listing. I figure if they bought the specific product, they have every right to them too. I feel it's misleading for a seller to use any for a duplicate listing of the same product--but, if the product remains in the same condition as when originally purchased, why not offer to save the buyer some time/hassle later on down the road if they appreciate the quality of those already taken? (Thank you)--I would hope they'd be considered a perk or added selling point, no matter how small the gesture..."free advertising' comes to mind (you're welcome). ; )
Stock photos are different, of course--in which case I note they are used for identification/reference only. AND, in defense of their use, we sellers know there are not nearly enough hours in the day sometimes. Enough said.
