Well the one I have the biggest pet peeve with 
(and this can go with anything one ebay not just 
cels)are with ebay dealers who immediately WANT 
top dollar for the cel but they will still start 
the auction off at 1 penny.  
And to tack onto this one the ebay dealers who 
want extremely overpirced amounts for a cel 
thats not very good in the first place but is 
from one of the extremely popular series of the 
time, and no one buys it and they keep listing 
it for the same high price over and over and no 
one buys it. Its like the guy cant get a clue.