I have been scrapping for 1 year this month and I easily have a $100 a month habit. That's what I budget for myself at least. Who knows if that's really all I spend though!
I tried setting myself about a $20/month limit last year for a while.... that didn't even last one month! I spent $60 one day and tried to convince myself that I wouldn't buy anything else for the next two months... yeah RIGHT!! But I go in spurts. I probably didn't spend anything during December.... but when I went to use my AC Moore gift card in January I spent another $50 on top of the gift card amount! But as long as I am continuing to actively scrap and not just "collect" the supplies, I try not to feel guilty. After all, this isn't for ME.... it is a gift for my kids! ................P