As a shopper at some quilt shows over the years, it seems to me that the miniature art-type quilts get the most bang for the buck. The investment in materials can be slight compared to anything bigger, and if many of the shoppers are likely to be quilters or crafters, they may be more inclined to buy something that is unique and creative, but not too big and not in the category of "I-could-easily-make-that-myself'. When people are shopping for something for display in their homes, they tend to go for things that express individuality. A handmade item that's not like hundreds of others will be a bigger draw. Also, utilitarian items, such as a set of placemats or a table runner, may have more potential buyers than a big, expensive quilt. A lot would depend on the nature of the shoppers. If it's a general group from the community they might go for things that have a local theme, such as something using licenced sport fabric or colors for a nearby college or high school.