How come nobody's interested in joining new Clubs on this site?

People might not know about the club yet. Others might know about it but might not be interested in its topic, so they don't join. The best bet is to Werben the club in related clubs, bringing to people's attention. Members aren't automatically made aware of all new clubs, so unless they're advertised oder people look for that subject, they won't find them.

People need to Werben their club to get people's interest. And everybody has different interests. Du need to have patience.