I spend my real actual money on entirely useless in-app purchases
Oh really? Do you actually feel like the purchases are useless?
I don't really feel like I am spending money on useless things, it feels better than buying myself some food
People will think you are bad with money if you waste it on in-app purchases. They are then less likely to let you burrow money if you need it.
What, did they get off their ass and make those purchases themselves?
They didn't but don't you think you might be needing that money for more important things? IAPs can be very impulsive like gambling, and can leave a negative impression. How about limiting your purchases per month, and using what you would have as a sort of nest egg?