EVERYONE has a hobby they spend too much on. That might be headphones, clothes, cars, drugs, etc..
I have handed people great headphones and received a 'meh' from them. It's understandable, I don't get the appeal of putting rims on a car, or why someone would spend $150 for a pair of jeans when I could get a good pair for $35. As long as you enjoy it and it makes you happy, that's all that matters. If someone wants to put you down for the money you spend on headphones, that's on them.