Consider your bottom line.
Personally I think it takes MORE energy to do small group than one on one
I charge $20 per person for my boot camp (just raised it from $15 for 6 years!) and I get 8-10
It can be a win win if priced right.
If you charge $12 for 5 that’s only $60 for you. So base it on what you want to make for that hour.