The answer to your question can be found by you, by playing a bot. Now imagine you want to play 1000 bets and say with 100 satoshi's, will you keep on placing a single bet every time? Just calculate the time you would spend doing that. So the answer to your question is people do it to save time, do they make profits, I doubt honestly I doubt they would be making profits. Should you use it, until you want to play small again and again go ahead, otherwise not recommended.