Sold my first ever bass (Jim Deacon!) to raise funds for my first 'proper' bass - Fender P Lyte, which I still have.
Only sold one other bass, which was very closely tied to a band I was in, but departed from in very messy circumstances. Couldn't stand the association, so the bass had to go.
Currently having on/off debates with myself about shifting my ACG, but that's only because I'm not playing much these days, and it seems daft for it to be sat there, not being used... In reality, I just need to get myself in gear and play more! Plus Mrs Simon. would kill me if I did sell it. Always a bit of an incentive!