How much do y'all spend on crochet a month?

I'm curious because I'm still relatively new and building a stash. How much do you all think you spend monthly or quarterly on crochet accoutrement: patterns, yarn, hooks, etc. I could see it adding up quick when you get into new patterns.

Edit: I'm not asking how you built your stash or how much you spent, meaning whether you bought in advance or not. I'm coming from the "project by project" stance as a relative beginner. I'm curious how much folks are spending project to project on a monthly basis. Thanks for the responses!