Before November 6, 2014. Fee structure 10% of selling costs capped at $250
After November 6, 2014. Fee structure 10% of selling costs capped at $750
Example. If you sold a $2500 pin or a $6000 dollar pin, max fee the seller paid was capped at $250.
Today, the pin that sells for $6000 would cost you $600 in seller fees.
Moral of the story. Sell your pins on Pinside and donate.
ebay.com link: sellers update to maximum final value fee and automatic relist feature