Hey supair, there used to be the hcl leagues a number of years back. As I remember, there were three divisions of about ten 10-man teams in each. You played six rounds or so and then at the end of the season you had promotions and relegations. It was exciting stuff for two seasons and then problems occurred, which I guess boiled down to one thing - comittment. Getting the same ten teams, and ten players in the same place six times in eight months proved impossible. OK at the pro level (ist div) it worked, but I remember the Cheetas turned up with only four players one round. I watched one game where they turned over split peas (I think) who had a full ten out there!
Also, i think people got fed up playing the same teams each month, teams split up, and then grudges set in and it became a bit of a mess. To be honest, I think it would go the same again now.