I've sold things on Ebay (not quilts) and the seller fees are really high. However, the exposure may be higher than Etsy.
I bought antique quilts on Ebay but would never sell any at this point b/c of the fees and the economy.
At one time I really went overboard buying them and now wish I could sell but I'm waiting for the economy to recover.
Hope this isn't too far from your original question!! :)
I've just seen a diminished market on Ebay over the last 8 years. JMO