It depends on what you envision to do with a piece of fabric and how much is the fabric marked down. And sadly, it depends on your budget. It is so easy to buy fabric especially if it on sale but I stay away from fabrics that are cute but probably would never use. You learn from your mistake you made in the past. Now I just buy what I need in order to finish a quilt and lean only to buying tonal batiks which I seem to use in a lot of charity quilts. I use to buy 1/4 yard cuts if I was collecting for a certain scrappy quilt. But if I was going to make a queen size quilt, then you buy the 3 to 3.5 yards. It is fun collecting fabric but just don't let your stash overwhelm you.