I don't think it's a "great" idea but, being that Thomas pays to host the Meet-up he does have the right to encourage people to be active in the group if they're going to be a member. Having a Meet-up site is not necessarily free and it can be some work to up keep as well as organize and host meetings. It can be frustrating to put time and energy into something that other people take for granted. It might be appreciated if people who claim to be members were to step up and act as such. Put your money where your mouth is.