For me it is using up fabrics gathered over the years. Now when I die cut shapes I have been putting in some of the nice sized pieces to donate to a church run store in town. The pieces are too small for my smallest die to make it worth keeping. The gal that sorts through the scraps stated people who applique love the scraps she bags up to sell.
I am not saving every small piece because I have so much of the bigger fabrics to cut up.
I rarely buy new fabric, only if it is for a special quilt gift.