Having sat on the TVL and Wetherby League committees, I think I can offer some views.
Firstly, finding people to sit on a league committee of any sort is a hard enough job. That's just 12 meetings a year, 2 hours per meeting. Then if you start asking for people to take on tasks (ie. checking match returns or a discaplinary committee) it becomes a needle in a haystack. While most people who do take it on are relatively normal and care about the players/clubs, you can get difficult individuals who have agenda's or non agenda's. You can get lots of bad decisions or none made at all. Stick 6 committee members in a room and 4 of them will have different opinions. Not sure which one is more frustrating to be honest and I could tell you some stories that would make you question why you should play cricket at all.
The other problem, much like the first class game, is if you started again today, you wouldn't have the same structure you have today. Many leagues were setup 20-30 years ago and some rules are so difficult to remove (two thirds majority kills most chances of change) that they will need the league to dissolve first. One classic example is the TVL lower leagues. For approx 10 years (since ironically I raised it) there has been a requirement to reduce overs for what are mainly development leagues. Something only happened when several TVL clubs threatened to break away into a seperate local league.
By all means get involved in committees but bring some mates with you if you want to get things changed.