Re: Dojo loyalty or personal gain?
I experienced such situation once. I didn't know what happened, so I stay in a dojo after many blackbell left. After few years such situation happened again. It looks like sensei did some errors in jugement. He is one of finest aikidoka I know, but is not able to keep high ranking students with him.
However, those blackbelts weren't able to create new dojos or even maintain regular practice in other places. In the end they all stopped training.
With time, I presently think, there are senseis with kind of personalities that make even very high ranking student stick with them very many years. There are also other personalities, that can have only relative beginners in their dojo. I still can't figure out the reason for it.