Man, I wish I made the type of money most of you guys seem to haha...
This can be hard to quantify but I'll give a couple of numbers.
My two cars OTD purchase prices added together equal about 75% of my annual income lol.
My monthly expenses (gas for the cars, insurance, GTI payment, etc.) equate to about 32% of my monthly take home pay after taxes, retirement contribution etc.
I also spend money on stuff for the Miata, but I'm too lazy to add all that up right now, but so far I'm probably averaging < $100 per month for that, since there's so much that needs to be done on it that doesn't require much in the way of parts.
Many of you guys may think it too much, but hey, it's my main hobby that costs. I also play music but I own all of my gear outright and rarely drop coin on that stuff. In all honesty, knowing what I know now about being an "adult" and supporting myself, the GTI purchase wasn't the greatest decision, but whatever, live and learn.