Don't assume that a human being looked over your auction and decided to pull it. That's the sort of thing that eBay hates doing, because human beings are expensive.

Consider instead the possibility that it might well have been a 'bot that misidentified the nature of your item as prohibited based on keywords it found in the title and/or description.

I recently had an item pulled because they considered it to be "medical" in nature. It isn't a medical item, and one of the pictures even shows a sticker on the device specifying that it's "not for human use". I've sold similar items in the past without any problem, and there are a number of very similar items up for sale on eBay right now.

I did, however, see an item similar to mine show up in a search recently, and then discover later that the item had been pulled. Again, I suspect a 'bot at work; maybe they tweaked the keywords recently. I'll keep tabs on similar items, and see if I can figure out if there's a "secret word" that got me.

I can understand how this could happen as a legitimate error. What galls me is that they don't provide a convenient way for users to communicate with them to help them tune the criteria used to decide if an auction should be pulled. Wouldn't it be better if your message from eBay had included a link where you could appeal the listing cancellation, with the hope of getting some actual satisfaction?

As it is, there's no way that I'd relist my item unless I thought I had figured out how to make it "acceptable". Relisting it without any changes would be a great way to appear to be a "repeat offender" in eBay's eyes.