Plans for a new study group format

My Swedish study group has a problem with people who show up only once.  This causes a few problems.  I’m re-doing chapter one over and over again.  Sometimes I get zero turn out, meaning people RSVP’d yes, but no one shows at all.  

I don’t think it is the format, the Icelandic study group I lead has regular attendees, but they’re motivated by the complete lack of alternative ways to learn Icelandic.  

I’m thinking of charging $20 a month, refunded after four weeks, less $5 for each missed meetup.

I’d use the money to pay for spare books (very few people are motivated enough to mail order the book) and feed my IKEA habit.