Hollywood - like any other industry - has a game you have to play.

Plenty of notable GREAT actors, from Terrance Howard, to Tom Sizemore, have been 'blackballed' for their actions and their ability to work with other people. Nobody wants to work with a shitty person, especially if at the end of the day that person doesn't exactly move tickets. Someone might put up with like, Mark Wahlberg or Jennifer Lopez (no idea if they are bad to work with - just saying box office numbers) because they sell tickets.

Mo'Nique doesn't.

She was a supporting actor with a great role and she played it amazingly.

Take a stroll through Wikipedia supporting actresses to see that's not a golden ticket to get a bunch of other movies.

She seems like a nightmare and she didn't play the game.

Oh well.