I would argue that reason 4 is being a minimalist. There are some of us who dont want more gear than we need.Reasons to sell a bass:
1. Financial reasons
2. Dislike of the bass
3. G.A.S. attack
All other reasons are a variation of one of these 3. So which one is it for you @Dr. Cheese ?? Why thin the herd?
I recently sold 2 basses for reason #3. It was a great decision.