Late to the thread, but I think it's worthwhile having a sit down and a think. What did you originally buy it for? I don't mean that in a negative sense, as in "what on earth have you bought THAT for?" but what were your original motivations?
Next it would be "what has changed?".
So maybe you went down this journey to see how far it went, and it goes quite a long way. Did you have fun on the way? Did the next box give you that extra scintilla of musical appreciation, or ownership pleasure, or other motivation?
Have you now done this? There's no harm in saying that you are done with it. I've owned sports cars, it became fairly clear that at the time I probably preferred mending them to driving them. So I bought a 2CV for £300 and mended that. These days I'm not very interested in mending cars so I have moved on. That's fine. I still like making things in the workshop, but other things.
Plenty of people do this, they work towards a grail, having got there they decide that maybe the quest was more fun than the arrival. You can be Fred Dibnah and spend thousands of hours restoring a steam engine, but what do you do with it then? You either take it to steam rallies, or you build another, or you say "done that now" and sell it. Your choice.
Only when you know the answers to this will you know if it's right for you to sell up. Do you want to sell it all? I don't know. Do you want to start again? Is it the search that you miss? Do you listen to music very much, or is it just the radio in the kitchen? It's up to you. I used to be into photography. I enjoyed learning how to do it, these days I don't pick up a camera from one year to the next. I don't miss it. Some people are like this with a sport.