Not everybody sells eventually. I've never sold anything headphone or audio related, except when I made the flit from the UK to CH, but even then I brought my headphones with me - well one. Sure I've given away headphones, or just basically lost them in the battlefield of life, but I've never sold them.
For me the paint chips are neither here nor there. Although I'll admit that for a $500 headphone it's a somewhat crap. However, it's the functionality that counts for me, and as long as the SINE keeps singing I'll be fine, chips and all.
For some reason I always keep hold of audio gear. I think that it's like a lot of people here, in that I follow the the reviewers, trends, and of course my own hearing and end up buying the next big thing - 'cause I can. However I always keeps the old stuff around for reference. Sometimes things can go full circle, in that an out of production headphone that you bought 20 or 30 years ago suddenly becomes relevant again.