I have purchased layer cakes when I have found a super deal. I only use them on patterns that use the whole square (or patterns using charm size). If a pattern is using 8" or 9" cuts, I do not like the waste. Sometimes the layer cake is easier because of the variety of prints available. But, figure 40 pieces at 10" square, so 4 across equals 10 cuts of 10" equaling 100". Close to 3 yards. Does that layer cake cost less than you would buy 3 yards for? Really rough way to figure it, but that is how i determine if it is a good sale. Since you are not going to use the whole layer cake and just save half for a possible future quilt, I would think a better deal would be to purchase yardage.