Debbie and I recently started karate together (well, I started again) and I wondered about maintaining standards versus growth. On the one hand, you want to maintain high standards that encourage people to join and build up the club's reputation. On the other hand, you need instructors if you want to grow, and not all of them are likely to meet the standards, so eventually you need to start being more lenient and allowing average instructors through, rather than just the outstanding ones. Past a certain size, you'll either lose your standards or stop growing. Probably both at once. High standards are (usually) incompatible with fast growth.
Mokalus of Borg
PS - I can't think of any general high-quality growth examples off the top of my head.
PPS - I'm sure there are a few exceptions that prove the rule.