I've seen many games where it seemed that the pitcher should come out, but he is left in. Often bad things happen. Last weekend I saw a game in which a pitcher gave up something like 7 runs, which basically put the game out of reach. This happens from little league to college (and the pros?).
Obviously I know there is a lot to these decisions: are the backups worse? do you need this guy to eat innings or get the experience? is it a non-conference game so you don't care? is no-one else warmed up? is it that there are 2 outs and you are just hoping he can get the third?
I'm curious what the thought-process is.