"As PJ said, but also, it is crime against all the honest sellers who only charge what it costs to post, and pay fees on the rest, while the cheats who load the postage cost do end up with less fees.  Therefore overcharging on postage is dishonest, and if seller is dishonest = ripping off eBay, why should the buyer trust them they will not also use any opportunity to rip them off?"

So don't buy off them its that simple, but if you do don't complain.  If all buyers followed that simple rule  market forces would remove those charging excess postage

Poor old eBay going broke due to sellers charging too much postage.  Please, give me a break, eBay don't give a toss about sellers, I suppose doubling store fees was due to those nasty postage pirates nothing to do with greed.  Using your theory why would any seller trust eBay they were dishonest about store fees?