I just came to realize recently that I suffer from Quiltheimer's disease and its accompanying SABLE syndrome (Stash Accumulation Beyond Life Expectancy). .....and yet, I still buy fabric that speaks to me (oh-oh I hear starchy voices - lol) I find that 1 yard is OK for most, 2 yards works well if any fussy cutting is required. 3 yards if I really really like it, 6 yards or 9 yards if it is to be a backing (well, backing +)
I stash my backing fabric separate from the other.
My regular stash is sort of sorted into colors and in those plastic bins (except for the "topic=specific" bins, the scrap bins, the UFO bins, and the overflow on the counter - let alone the projects still in the shopping bag.) aaaarrrggg.
I also do not mark the amount or the price - frankly, when I run out of fabric on a project, I have to get creative with what I got and that works well for me.
I'm a visual person and having my fabric behind closed doors doesn't work all that well. (But that's what I got, and I make it work)