I have found this annoying as well.  I am
currently looking to pick up a copy of Nadesico,
and have found that the majority of the copies on
E-bay are bootlegs...  

I think the thing that disturbs me the most is
when somebody puts an image of a cel or a
wallpaper on a t-shirt and attempts to sell it for
$25...  

I think there are a lot more anime items that are
bootlegged on E-bay.  I know, for example, almost
every one of the anime pins I have bought are
bootlegged.  I didn't find out they were until
recently.  E-bay doesn't seem to care if they
allow people to sell bootlegs or even fansubs for
that matter...