I don't keep a budget. What I have found is that the first year, the expenditures seemed really high - rulers, pantos, threads, etc - all the things we need as we delve deeper into this journey. Since then, expenses have definitely gone down - have the basics so now just replace threads, try a few new ones and get an occasional new ruler.
I have gone computerized so the paper pantos are a thing of the past - digital can be easier/more tempting to load up on - again, initial spending was high - dropped dramatically as I am more aware of what I want and "need".
And finally - fabric. Lucky for me, I live in a condo and can't store that much fabric. Last year I made a commitment to really put a dent in my stash and was very successful. Still have too much, but I'm no longer on overload.
So, for me, I guess ......... the longer I am at this, the more I learn just what I want to do, have the products to do it and my spending is much less.