Referral links in Ebay listings

Tweet

I've been trading on Ebay for a few months, just in a small way, and I've recently also joined one of those cashback shopping websites, which enables me to buy stuff from ebay.co.uk and get a small amount of money back. There's a referral scheme, and I wondered if it would be a good idea to include a referral banner in future Ebay listings. I know you can do listings in html, so this should be technically possible, but does anyone know if Ebay has a policy on this kind of thing? Would they object and delete the listing?