The biggest reason to by pre cut 10 inch squares are that you have a much better variety of fabrics If you purchased 1/3 yard of 20 fabrics that would be buying 6 2/3 yards of fabric. Yes you would get 4 of each fabric instead of the 40 pieces you would get in the pre cut package. But how many of us would really take the time to pick out 20 fabrics and have the store cut 1/3 yd of each ,even if they did have the complete line that we were looking at.