That's a very good question. Many were second hand (some slight, some more severe fit issues). The three I had custom made I sold because:
LOL...In all honesty my tastes for crosszips started to dry up. But I've found myself thirsty again. I'd really like to try another one of Aero's leather offerings too. I've been through plenty of CXL.
lol
Perhaps an idea is not to sell things immediately, but to archive them and come back to them later?
It works pretty well for me. Since I don't like the sales process as such, I keep a lot. And it is not uncommon for me to remember after a long time that I still have this and that and there is a revival.
However, if this revival is short-lived, then it really is time to pass things on.