Here's the thing...as a former full-time (now just part-time) eBay seller, I can tell you first-hand what a pita it is to list things for others. You might pay a good portion of your final sale price in fees to the seller, but let me tell you eBay aint cheap. There's listing fees, final value fees, other fees to make your product stand above the masses, shipping, etc. And that is even assuming the item sells! The market changes minute by minute.
I can't tell you how many times people have come to me with their dusted-off "heirlooms" or "collectibles" with the question "what can I get for this?" Often the answer is nothing because what they truly have is junk...not saying your stuff is but most people think anything that belonged to Aunt Sally is a bonafide rare antique
If you are going to ask someone else to take possesion of your item, photograph it, list it, babysit the auction, conduct all communication with the buyer, wrap it, ship it, and assume a return policy then be prepared to pay for that service.
After doing this at "cost" for friends and relatives (and getting burned once too often) I changed MY policy. If I thought I could move something I would just simply buy the item from them outright and sell it myself.