It's:Clerkin said:true but there still not hurting anyone
A) Cheeky
and
B) Plagiarism (I think)
If I've taken the time to write a listing that will help me sell my product, Joe Bloggs from the Ebay community has no right to copy my listing verbatim to help boost his sales. Chances are it'd mean that he would be selling under false pretenses because what he is quoting is my item description based on my product, not his. His product may be similar but it would not be identical.
How would you like it if you were creating a classy website to sell to a company, and some guy came along and copied your website 100% verbatim and then sold his copy on? Surely that's the same as copying a band's music without their permission and selling it off as your own?!