paying a sellers paypal fees

don't know when this started but more and more sellers are doing it.it's just not right.i will not ask a buyer of my parts to pay MY fee.i pay that fee for the convenience of instant payment and a secure transaction.people complain about ebay fees.how is this different?i buy a part,pay for shipping then have to pay his fee?not right.i got pp so not to have to do money orders.this is just my opinion of course but i won't buy another part,good deal or not if this stipulation is in the ad.but that's just me.thanks for giving me a place to vent.rant over.