Ebay is usually different than other etailers in my opinion. Many of the sellers are not "in the business", they are either selling a few pipes they found, or reselling pipes they picked up at a sale.
A used pipe is a used pipe.
Unless they clearly misrepresented the pipe, its kind of an "as is" purchase.
Just because someone "doesn't like it" is a pretty crummy reason to return in my opinion.
I've bought plenty of estate pipes on ebay that I really didn't care for when I received it. But I never considered that a reason to return.
Again, in my opinion, the return policy should be used for a misrepresented pipe, a pipe that broke in the mail, damage the seller didn't notice....like a small crack in the bowl (been there)........
Honestly if a small time seller on ebay gets too many returns because someone didn't like the item, it could put them out of the game.
The return process, re-listing, ebays cut, delivering again.... may cost the seller more than they make on the item sometimes.
Again, this is just my opinion and I may be completely wrong because as all as I know is you bought a used pipe, and didn't like it, so you returned it.