Members love your community. In fact, they love it so much they want to create their own, smaller communities for specific groups of people. One enthusiastic group wants a community dedicated entirely to just one of your new products. Recently, a member committee decided to split and branch into two committees -- and, of course, they both want their own communities. A few other members are dedicated sports fans and want to have a fun community dedicated to your local sports teams.
On the one hand, this is great -- only enthusiastic members would want to pioneer their own community. They must really benefit from and enjoy the platform you gave them.