There are 5 of us training now at Tallahassee Karate Club! It's a small group, but I think we're having a good time.
There are definite advantages to having a small class. Students in a small class get much more personal attention and one-on-one time with the instructor. Also, the instructor can spend more time teaching to the needs of each individual. For a while in December and January, the folks coming to class were pretty much getting private lessons...not bad for them!
There are probably some advantages to having a big class. I've never really taught a big class, so I wouldn't know much about those advantages. I'm sure from the perspective of keeping the Dojo open and making improvements to the facility, a large class is probably better.
I'm hoping we end up with a medium-size class...Just enough people to keep the rent paid and make improvements to the facility, but not so many as to lose the "personal" touch that makes our style unique.