My personal thoughts are that I want to see the quality of the students. The instructor boasting about how many BB's he has promoted is white noise. Actually, 30 isn't really all that many, so I would wonder why he was boasting about such a number or if it were an indication that it was challenging and thus only 30 people actually have gotten to that point thus far.So, what are your thoughts on this? Do you feel that if you walked into a school and the instructor said that he trained 30 people to BB level vs. him saying that the BB rank is hard, not impossible to reach in his school, thus he only has a handful, that that is a factor in whether or not someone would join the school?
A healthy school should have a mix of students in all grades, ideally with a preponderance of students in the kyu grades. A school with few to no black belt (or equivalent rank) students is an indicator of a retention issue. A school with a preponderance of good quality black belts is likely having a recruiting issue. A school with a preponderance of black belts who look like green belts or yellow belts is probably handing them out like candy and is probably suffering from other issues.
A brand new student walking into a school will not have the same perspective that I do, however.