As a quilt shop owner, I do require anyone taking my beginner class to purchase the fabrics from me. I know that the quilter will be happy with the final product and I won't have an unhappy customer because of bleeding or fading fabrics. Part of the lesson is picking out and coordinating their fabrics for the pattern I teach, I can't offer that part of the lesson if they purchase their fabrics from some other place. I also know their quilt will last them for years to come. After the first one they are free to purchase their fabrics anywhere they choose, but most feel their time is worth a lot also and don't want to waste it by making a quilt that won't be as pretty as it was when they first made it.
OzarksGma