I hate, Hate, HATE when I put up a cel on eBay 
and then they:

a) don't pay 
b) don't email 
c) make excuses
d) haggle
or
e) take forever in sending a payment

If I put a cel up on eBay, I NEED MONEY. NOW! I 
ain't got time to play games with stupid idiots 
who have nothing better to do than whine, moan, 
or simply don't reply.

It's not fair to the other people who bid (and 
were WILLING to pay promptly) or to me when I 
dependant on the money the cel will bring.

Onto simply irritating.. replying to offers and 
trying to find a way to be polite. When I get an 
offer on my Skuld OAV cel for $20 (and being told 
I'm lucky if it's worth THAT much), then having 
to find a way to tell them politely and 
professionally that it's not even CLOSE to being 
an acceptable offer. >/

I like to come off as being a polite person, but 
some people make it REALLY difficult. @_@

~Nabs-chan