Does it ever end?

I have a solution. Add another hobby you are just as passionate about (motorcycles for me) and voila! Your disposable audio funds are now redirected.

I completed a big upgrade back in April of this year and I'm at a plateau on which I am quite pleased. Everything is broken in and the music listening is sublime. As ghdprentice said; I'm good for at least the next seven years or so.

I thought it would end when I couldn't find a single bothersome thing and/or achieved the sound quality I'd always dreamed of. This has proven wrong as in recent years adding variety to the listening experience via adding to the collection, now have three amps, two pre's, soon enough another one in plans, two dacs, two phono stages, two turntables to choose from. Not reaching for better just variety.

+1, @mapman 

Why hold back? You only live once. The key is balance—buy what excites you, then off load pieces that you no longer need. Don’t hoard. This approach has worked well for me and has let me enjoy the hobby to the fullest.

This will sound silly and counter intuitive, but I’d suggest you get a small, inexpensive rig to swap out once in a while. With no expectation of being able to hear an ant fart, you’ll be able to go from an anal audiophile to just a dude listening to a few tunes. 

It’s worked for me.