Even one Hub can earn you money. With your permission I'd like to give a harmless advice. If you're here for the money, you might as well give up. You're going to earn a few cents, maybe a few dollars if you're lucky, a month. It will take a long time before you can see real earnings coming in, perhaps years. Use the site if you're passionate about writing, if you get pleasure out of the written word. Otherwise, you might want to look into affiliate internet marketing. Much quicker way of earning online.
Just a sincere advice.