eBay assuredly has a spider crawling that is unrelated to sellers item listings. They've been visiting some of my pages for months. Having never crawled more than an a handful and never taking images.
In addition these is an employee who is "chasing" all outside-eBay URL links in sellers items (a violation of seller UAG) for what good this person does is unknown. The chaser visited a sellers page that had a link to one my web pages and did noting to correct the issue or remove the sellers items.
My solution was to redirect the referral to a portion of my websites that sells items of similar subject material. (Funny thing ;) the ebay chaser didn't catch that either because they just copied and pasted the URL instead of following the link.)
Personally I think the ebay bot is scanning for keywords to add to their arsenal. They are building landing pages with them .. I've seen a few come up in the serps recently.
I'm inclined to "make" eBay jump through the same hoops that they require to report violations of TOS by their sellers who attempt to link to images or even copy (word for word) material from web pages to hawk their items.