Is it worth it?
If you want to make money - the answer is no. The fees are set up to give you slightly more than your on-site expenses. It doesn't cover mileage or your time to do the shop.
If you are going or want to go to their 'fun' clients, then it is more worth it. You can bring guest(s), enjoy the experience, and get some cash for your time. As such, this company's shops fit more into a "life enhancement" category of shop.
An exception was a membership shop. The shop was to purchase a one year membership in addition to visiting the place. It was a nice perk.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut