I'm not sure if this is still "illegal" but when I post something, I usually post it a price with shipping included. When I post that price, I keep all the costs, including fees in mind. That's not to say that I tack on the fees, because we're not allowed to do that, or at least ask for it out loud, but I'm at least aware of it in the final amount that I'd like to pocket. Because the price you ask for an item can vary a little bit, I see no problem in asking $750 for something while someone else might ask $725. That $25 is usually more than enough to make me not care about the paypal fees, even if I'm not consciously varying the price to make up for it.
If any of that makes sense