selling fees when item is picked up

If you have sold a item, with a postage amount specified ( in this case $65 due to it being a bulkier item ), and the buyer has elected to pick up the item, how does ebay then calculate the its fees. Surely they can't charge a fee on an amount that includes postage, when postage and pick up were an option in the listing, but in this case postage was not charged as buyer picked up. I couldn't seem to find anything in the ebay literature regarding this scenario.