Why so many headphones for sale with less than 10 hours of listening time?


I've been in the market for a new pair of headphones recently, but have noticed that an unusually high percentage for sale are classified as "mint with less than 10 hours of listening time".  What gives?  How could anyone possibly make an accurate assessment on something with less than 10 hours involved?  Audeze is one of the brands I'm considering, but it seems like this is the one that has the most for sale with little time involved.  Could it be a comfort thing?  Any insight would be appreciated.
sense63
All good points tooblue.  I get that people purchase them and still listen to their main rig 99% of the time, but I've also read that the Audeze phones are heavy and bulky.  I'm not picking on Audeze, but until I can get to try a pair personally, I'm trying to figure out if it's something more than that.
Headphones actually take a long time to break in.  People don't realize it so they sell them because they sound thin.   My Sennheisers (HD650) took 500 hours to sound decent, and another 500 to blow my mind.  I can see someone selling them after 100 hours and buying Beats (and my laughing until my side splits).