Leagues are a double-edged sword, Nob. I know of a few pool halls where the leagues almost put the pool hall *out of business*, because:
1. The tables were commandeered by league play and the league players demanded that the sides of the tables be opened up (read: free).
2. The leagues players were the biggest cheapskates in the whole place -- not patronizing the pool hall's other services, not ordering a meal or eating, only drinking water or seltzer (with lemon) -- and demanding that the water/seltzer/lemon be "free."
3. Requesting (read: strongarming) that the jukebox or other music services be stopped "because this was a competition / tournament atmosphere."
4. Not partaking in the pool hall's pro shop "because I can get it much cheaper at eBay / Amazon / etc."
The paying customers were the ones that paid for table time, ate the food, had some drinks, played music, and bought things from the pro shop. And when the owner/proprietor started grumbling about not signing on for another league season, the league players had the nerve to tell the owner/proprietor, "you need us -- we're your best customers!"
Granted, not all leagues in all areas are like that. But I've seen more than a few places in the situation I describe above, which is their APA nights.
-Sean