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

Shhhhh don't tell, just buy and enjoy!

I am guilty of selling headphones after only an hour of use. I bought two pairs of Fostex the TH900 and Thxx (mass drop special model). The th900 I returned the day I got them (Amazon) and the thxx I sold the same day online. 

I I just did not like the tuning. Way too much bass and no amount of burn in or system changes were going to fix it. It is hard to demo headphones and they are "cheap" so I buy and change them out ALL the time. 

I am am in the minority here and feel headphones do some things much better than speakers. The major trade off is the soundstage sucks on all headphones so you have to know your priorities. 

I listened to the Fostex 900 at an audio show and really liked them. I have found that satisfaction with headphones has a lot to do with the amplifier that drives them. Listening through a Blue Hawaii headphone amp is a lot different than plugging them into a budget receiver. However, the BHSE amp can costs many times the price of the headphones.

Hi guys any advice amp related to make the HD800 shine?
Thanks 

I read a review of several premium headphones by Herb Reichert in Stereophile a few issues back. He tried out several of the big players and was pretty consistent in mentioning how deep into the music this new generation of headphones can be. When he got to a pair of Audioquest Nighthawks, they sounded dull and closed in. He called AQ to find out what's up with 'em and they said the 'Hawks need serious break-in time. So Herb let 'em run in for several days I think. When he put them back on for a listen, they became one of his favorites of the bunch he reviewed, and they were near the bottom of that bunch's price range. 

Ten hours is not nearly enough, and headphone diaphragms have tiny, delicate movements. It stands to reason that just a little bit of suspension stiffness could really make them sound dull and uninvolving.