Fun? Its about the principle mate.
You bid an amount your prepared to pay, win the auction, and suddenly your faced with a bill thats £100 higher. Plus if that occurred, the winning bidder would then be the one in the wrong if they backed out.
I stuck a tenner on it, because i am actually in the market for some uprights, get my bid confirmation thru and notice it says "Postage £100". At first i thaught that wouldnt matter as i would plan to collect it myself, then i looked closer and realised the only shipping option was "Collection in Person" and they were charging £100 for it.
I dunno about you, but i dont particularly enjoy people trying to rip me off, and a hidden £100 charge for "postage" is taking the **** just a little!