Moderating job isn't all it cracks up to be. I have moderated before in other forums and it does require you to devote significant amount of your spare time to be an effective moderator as well as the added responsibility. Also you will have to read every thread, even ones that don't interest you. It can get boring fast. It's not like you can go around abusing your power, that's not what it means to be a moderator.
And if you only want to be a moderator to feed your power hunger, then it's just a sign of immaturity. Good moderators usually don't expect anything in return for their service, they just want to help make the forum better and pleasant place to discuss their favorite topics. At the same time, since moderators do participate in discussions, they have to keep their words in check so not to aggravate any minor situation into a bannable offense.
That's my 2cents on moderators