You may or may not have cheated at work to get ahead, but that's a lot different than betting.
Say your a CEO, and you bet the CFO that employee X doesn't get a promotion. Well, you're the one that decides whether he gets that promotion or not. So, in other words, he won't be getting it. Now, is that OK? Is that a fair bet? No. You have decisions to make that will play into that promotion or not. Now, I'm not saying that Pete Rose bet on his team to lose, but, as Manager, he made decisions as to if his team had a better chance to win. If he had a bet on that particular game, that's wrong.