Just a thought but, a lot of posts on here regarding the lack of Pro division teams. I run an active league and now have pretty full Rookie(teams joining every day) and full Elite however have the same issue with Pro. You get a lot of good active Rookies promoted but then Pro is full of inactives(kept to maintain promotion) or filler accounts from other teams there again to make up the numbers.
Might be an idea to increase the amount of promoted teams from rookie (from 2-4 or 4-8) thus increasing the active numbers in pro. This could be a feature turned on and off depending on how full pro is and managed by the league manager....