No, I don't keep track of anything. But if I buy paraticular fabric to make a quilt I've already decided on, I make the quilt top right away. If I need more fabric it enhances my chances of finding more to buy. I've found fabric on Etsy that the stores no longer carry.
Once I ran out of a background fabric that I needed to finish a quilt. So I set the quilt aside...for 11 years. Well, imagine my surprise when it reappeared in the stores. So I bought more and finished the quilt. The dye lot was slightly off, which I liked as it gave a subtle contrast to what would have been a rather flat look.