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They also need need to keep their existing members happy.. Current generation of teens do not like the club atmosphere so kids are keeping parents away... Interesting and new activities like discover scuba could occupy a generation of kids that are hard to keep their attention in the sound bite video game world.
Most of my friends have single memberships for their own golf/tennis playing... having dropped family membershios years ago as their kids got old enough to no longer be dragged to their club for swim lessons and such.
Perhaps that's an in... Offering the club a reason for members to bring their families to the club? Offering scuba lessons "exclusively to members and their families."