I hate league as well and would never play in another.Maybe some of my reasons strike a chord with you.
1st - I could easily beat 99% of the people in league and found it boring.
2- Alot of the players weren't there for pool but to socialize, which is fine for them but not for me.
3- Never being left alone to enjoy myself.
4- League play hurt my game eventually cause I started getting lazy at the table when playing in a big tourney.In league I knew most would never run out so I actually started playing dumber.
5- Finally, just the thought that I've committed to this weekly torture when I really don't want to be there.
I've seen my game go down the tubes after 4 years of league griding playing hard, improving really fast to try to become a good player hating to lose. I noticed even most of the "top players" don't run out. Start to relax, lose the drive, playing with people who don't care. Then you start to question yourself why your play is dropping, questioning and thinking about your stance and stroke while your down on your shot then boom....game has disappeared completely and your mental. Mainly play for something to do during the week and to qualify for their tourneys hoping to find a stroke again some day....