Hubpages actually is my occupation, but I'm not really earning anything just yet. I'm very close to getting my first Google Check though, and I've learned a massive amount of information about how the internet works from spending so much time here on hubpages.
Now, I know for a fact that I could have already hit several Google payouts, but I choose to write what I want to write rather than what I know will make me money. I can and will be writing more commercial and profitable hubs; but I've mostly got things to talk about that are non product related. I CAN hope that these types of things earn me recognition in other markets, but that's a LONG shot that I'm willing to take, I've got the time and freedom to do that.
Building enough product or problem/solution based hubs, the ones that really will make you some money, takes time; and lots of learning and promotion. There are several people that make enough here to not have to seek outside work, but it's not something that will build up for anyone in the course of a few months; at least not unless they really know some Jedi mind internet tricks that I'm yet to become aware of.