There is a small problem with embedded videos. At this time eBay only allows a few sites to host the embedded videos. All hosting sites must be approved by eBay. Now I did not find Photobucket in that list. You might be careful about using Photobucket's code. If you get caught eBay can cancel your auction. and/or suspend the seller.
Next step, find out what needs to be done for individual seller's hosting site to be approved. Nothing is ever simple, is it???