when students drop for the summer, it does mean extra good attention from the instructor, and more time working with the serious students, but as an instructor...I like the roar of a crowd as well. I give alot of personal attention and pull alot of people off to the side regularly, as well as have at least 1 additional black belt on staff for individual training at each class, so we give a fair amount of personal attn.
Even as a student, I always enjoyed the big classes though.