When I started quilting 20+ years ago, I bought a 100 FQ bundle of rainbow colors from a well known online source. I've used many of them. However, since then, I buy for projects, and occasionally a yard or two of fabric that I just love. I've also won fabric in shop hop drawings and once, 25 FQ in the Row by Row quilt contest.
I save leftovers and that has led to a moderate size stash (some laugh at it as they don't consider 3-4 small, flat storage bins a "stash" at all) and seriously, if I could bring myself to do it, I'd like to get rid of most of it. I've made a few scrappy quilts for charity, but that's not "my thing." In fact, I'm doing needlework (knitting, crocheting, tatting) now as a break from quilting. I have finished several large quilts in the last year and needed a change.