I don't add the paypal fees onto my buyers, I just take it as one of those things with running a business.
Ebay fees, and paypal fees are nothing.
I used to run a shop, and the cost of lighting, phones, rent, upkeep etc make a couple of pound here and there nothing.
If there were no ebay fees, no paypal fees, I would still charge the same, its an expense to me, not my buyer.