It is, but if you are there for full-time training, you are sure to get lots of one-on-one time with the teaching staff. And in most group training, at least half of the class are yudansha or "black belt level." Skill is built up through training with and testing yourself against as many different people possible. So instead of getting training with one "master" you get to train with several masters and a large group of advanced practicioners.
Wiz Cool C, does your teacher have the authority to get visas for students?