Someone owns the rights to that music and you are not supporting the rights holders of whatever music you buy when you buy used.
You should be more informed about the reality of making a living from streaming. I am actively supporting artists on Spotify. You are stealing from their pockets by buying used because it's convenient for you. I'm not saying that you shouldn't buy used, I am saying that you should climb down off that high horse and stop telling other people who are participating in the industry as it exists today that they shouldn't because you think that you're an expert.i think it's helpful to be aware. to be informed about how all this shit works as maybe it will effect someone's decision about participating in it. some people are thoughtful in these kinds of things, some aren't, some accept things as they are and are indifferent "not my problem" mode of thinking. so it goes. good luck with all the things.