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
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).  
Sense62, to address the issue of comfort on the Audeze, I have really enjoyed mine quite a bit over the few months that I have owned them and have used them hours on end with no issues with comfort, I use them with a Yamamoto H-2 tubed headphone amp that is very impressive in it's own right. Let me also say that I do not consider myself a headphone guy but did want a really good set in my retirement system for future reference and listening. I used the forums and reviews to choose the Audeze but I am sure there are a lot of other flavours in and around their price.