If I'm offering a few things in a post, I'll price separatley and ask for postage on top (having fees covered doesn't bother me unless its either very expensive or only 50p or something!). If I'm only listing one or two items then its usually an all-in price for simple's sake, postage and fees are taken into consideration when pricing but as long as the item sells I don't mind exactly how many pennies I get
I always reduce a little for multiple purchases as it saves me time, and would consider offers.
I don't think it's rude to make low offers, some people are natural hagglers (my Dad being one of them
) and starting with a low offer means negotiations can take place. And nobody has to sell to anyone if they don't want to
Classifieds are slow at the minute - that means people seem to be not willing to pay the prices asked (or else the items aren't in demand), doesn't that mean the items are really worth less? an item is only worth what someone is willing to pay. Not that lovely new nappies should be 50p or anything, but when people make offers, no matter how low, its a positive thing that they're showing an interest in your sales at all, if you're unhappy with what they offer then just say No, they probably don't mean to be rude
they just want to give you money for your used nappies (and that is something my DH finds truly disgusting
he can't believe people sell/buy them!)