You can sometimes relist for free if the item does not sell.
Here are the way fees are calculated for motorcycles sold on eBay. Source: eBay Motors fee page
http://pages.ebay.com/help/sell/motorfees.htmlHow fees are calculatedBasic feesInsertion feeYou may be charged a listing (or insertion) fee for listing a vehicle. If applicable, you're charged one insertion fee per listing.
Successful listing feeIf your vehicle sells, you may be charged a successful listing fee if:
You receive a bid on an auction-style listing without a reserve price
You receive a bid that meets your reserve price on an auction-style listing with a reserve price
A buyer clicks Buy It Now in a listing offering a fixed price
You accept a Best Offer
The amount of the successful listing fee depends on if you're a low- or high-volume seller, and the vehicle price.
The vehicle price is the final bid amount, Buy It Now price, or accepted Best Offer.
There's no additional fee charged on the actual sale of the vehicle after it sells. However, you'll be charged a successful listing fee regardless of whether you carry out the sale with the buyer.
Optional FeesAdvanced listing upgrade feesIf you add advanced listing upgrades to your listing, fees apply.
Supplemental service feesIf you use supplemental services, charges associated with these services may be included on your seller invoice as fees.