lots of hobbies are like that. don't let the haters get you down.
another hobby of mine is high-end and vintage fragrance. i have something like 80 bottles. my most expensive being $1,750. when i tell you that, how do you react? do you think i'm stupid for spending that much money on a bottle of cologne? do you judge? or do you not care at all? important to be sure we aren't being judgmental ourselves.
but it's fun and brings me a lot of joy, like my headphone hobby. my brother digs on toy trains (expensive). my neighbor restores muscle cars (very expensive). a coworker is into riding horses (extremely expensive).
at the end of the day, you get one go-around in this life, so enjoy the amazing things available to us, while we still can. because this ship is going down soon, let me tell ya....
i feel far sorrier for those who make fun of others' hobbies, and have none of their own. so when i pour a scotch tonight and put on the legacy edition of Kind of Blue by Miles Davis, slip my Utopias over my head and drift off into a bliss i can't even put into words, i again will give nary a thought to those who think i spend "too much" on headphones.