Me being a guitarist, I probably spent a solid 10 years buying and selling guitars. Thousands, literally. Some weeks I'd get a guitar in the mail, check it out for an hour, then list it, and sell it the same day. I have a friend that goes through the same deal with pedals.

Luckily I started experiencing some serious "burnout" - where I could no longer feel any dopamine rush from getting new gear. In the end I had two good guitars that I played on for 5 years, and nothing else - I had little desire to buy something else, but it might also have been due to me becoming more interested in other things.

Now that I'm building a small home recording studio, I'm starting to feel the burn again. And I guess I've had some small relapse with the guitars, as I currently have 20 excellent guitars in my house...I could, and should, sell everything but a few.

The worst thing is that you stop progressing as a musician, because all the buying and selling steals your time and focus.