I'd have to guess I spend between $750 and $2000 on pokemon related items thru the year.
PR, sleeves, boosters, boxes when I have the money, money i spend at league, etc. More if you include the food/travel included when I head to league.
I work my ass off though (kitchen manager), live on my own and pay rent/expenses (I'm 22). Considering that I can afford it, and pokemon is essentially my only major hobby outside of work (that costs money/I focus alot of time on) I think it's a fine amount. Considering the things I've gone through in life I think I'm in a good spot.