'Technically' you ought to show things here, so if you post a kind of copy of your ebay ad here, you might mention that there are more photos/information/higher pricing on an advert on eBay, just in case it sells there....folks sometimes put in that something is also for sale on XYZ....so I can't see it being an issue.
Just don't advertise here to drag folks elsewhere, iimmc ?
I genuinely don't see it being a problem for you
M