Just looked up ebay selling rules
When your item sells you pay 10% of the final transaction value, including postage. We call this a final value fee. We cap final value fees so you will never pay more than £250 for a single item.
If your item doesn’t sell you usually don't pay any final value fee. However, if you offer or reference your contact information to another user or ask a buyer for their contact information, in the context of buying or selling outside of eBay, we will charge a final value fee for introducing you to the buyer. In this case, the final value fee is the higher of the fixed price, auction start price, Buy it now price, Reserve price or the price identified between the buyer and seller, as the case may be.
