Over the past few years I've gotten better jobs and higher salaries, but I still get pretty guilty if I want to spend non-trivial amounts of money ($800-1500) on additional audio gear. I don't hoard stuff.. I usually sell with minimal loss whatever I don't use. I have some other hobbies that could get expensive (cycling, photography), but I only spend on those every few years. Ideally, we hold on to things for a few years so the cost is amortized.. but there are phases of exploration where we want to try out a bunch of things and may spend more (where I'm at now) Situations differ.. (marriage, kids, mortgages, other debt), but in general, how much are you OK spending on audio (or other hobbies), as a percentage of your gross annual income?