In my guild of 40 members, there are about nine of us that will sign up for classes and workshops with enthusiasm as soon as the list is ready. All it takes is one of the bunch to say let's do this together it will be fun. Some members will hear us talking about the class coming up and and sign up before the deadline. The loners of the membership will wrinkle their noses and complain about the cost, the teacher, or anything else.
Talking the class up to a group of shoppers that come in the store it will be a group decision to do something fun together, the individual shopper will usually say no I don't think so.