I have a couple of observations: With the price of LQS fabric quite high, I wonder if quilters want to use their money for fabric instead of classes, since so much can be found on the internet and other free sources.
I wonder if quilters fear having another UFO, when the class is over. I have to Really like the project to sign up, so that there is good probability that I will finish it at home, if not in class.
I wonder what is your "audience's" skill level. Perhaps most are somewhat experienced quilters and need a class offering of more advanced designs. I have taken two EPP classes; both just showed the basics, step one, making the hexis and rosettes, but neither wanted to show how then to assemble into different designs, etc. See what I mean?
I take classes to learn new techniques or because I love the sample project, but also to get acquainted with other quilters and pick up tips and techniques from the teacher. There is always something to learn.
Just some things to think about. Best wishes on figuring it all out!
