Yea, but is it really worth getting yourself all stressed out about something so trivial? You're basically getting yourself (and I'm not meaning you, just a general you) angry over what other people do with their disposable income. The question is, are you getting angry over the items in question because you want them yourself and just either can't afford them and other people can? Or, are you getting angry because you don't want anything at all and feel that because there's no value in it for you that they don't need to exist period for anyone?
I don't really 100% agree with the cash shop either, but I have spent money here and there sparingly over the course of 5 years on items. In total I've only bought 4 things: (Starseeker Bow (Missed the event), the Eastern Lady Togi, the Fuma Kimono, and the blue Carby mount). And that's whenever I had the extra funds to do so and that was my business alone, most of them were just little things to brighten my day if I had a bad day at work or just a crappy month in general.
You can't really put a price on other people's happiness and what they find that has meaning or value to them. And I guarantee if you were to walk up to someone and say "Hey! I see that you're going to spend $24 on that mount in the cash shop. Don't do it."....they're probably going to look at you sideways and question why your opinion has any weight on their own wallet.
I don't know, maybe I'm at that point in age where what I do with my wallet is my business and if someone tries to tell me otherwise, well....unless they're going to offer to pay my sub or utility bills for me, then they can have a foot in the door about what I do with the money.