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.