There used to be, maybe still is, an outfit called BidPay. I dunno if its still around or not. I'm sure if it was around, eBay would not allow it.
I've noticed a trend on eBay: inflated shipping prices. Sellers try to make up for higher eBay fees by adding handling charges and what not. I'm sure there are plenty of folks that jump on an attractive Buy It Now price, only to realize that the shipping charge is through the roof.
I don't operate an eBay store, but I do buy and sell on eBay. I think of it as renting. As an occasional seller, I have to confess that I charge an extra $6 handling fee for shipping outside the US, but that's because eBay / PayPal estimates are consistenly off by about that amount.