I waste a lot of money. As kid I never really had the things that other kids had, and my parents refused to buy me them. So as a young adult making a reasonable amount of money, I bought myself a number of things on a whim, like a GTX 1080 TI 😍.
I tend to spend money on things that I want to get into, like building your own computer, getting started with iOS development, or using a new piece of software.
I don’t spend money on much, I live like a monk. When I do spend money its on things that are some what nerdy, and I spend a lot.