I did it primarily for my own continued dive education and do not intend to work in the dive industry. Having said that, I do run a local dive group of certified divers and organize dive days for us. Since I happen to know the particular dive sites the best among the ones we frequent, by default I'm the diver who is doing the dive briefing and navigation in the water for the others. So the task is very much as a dive guiding divemaster would do which is the reason why I figured getting the formal training would be helpful. But so far I don't see how membership would benefit me unless I missed something. As a sidenote, we are located in Ontario, Canada where folks up here don't generally sue each other.