Clearly you've never played a game that actually does stick bots in when people leave. Sticking in bots prevents the cascading quits that happen in games like Gears when one person leaves. One person might lag out or have a legitimate reason to leave, but within 2 rounds other people quit because they'd rather not play on a shorthanded team and then you're left with 5v1. It makes the rounds a lot less stunted after someone lags out.
Also, it wasn't mentioned in the article Omagnus posted, but they are talking about having an XP penalty for leaving matches early.
Holy crap your signature hurts my eyes 
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Yeah I rarely choose to play games were there is bots, but that's just personally opinion. Good point with the cascading quitting (didn't even think about that). I just don't feel any satisfaction in killing a bot in a ranked game. Also a lot of people just quit because they're losing. If you're on the team that is pwning it's kinda satisfying to win and get on with another game.
Sorry about the signature, It's the first one I've ever made.
How ya doing, buddy?