I think the issue is that nobody is going to jump into article marketing and just start making a living wage any time soon. I think it's very possible to make good money with this gig, but it's going to take a long while to learn the game, and produce enough good articles to generate that income.
So in other words. . . .it's something that can do well for anyone; but it would have to be like a side project, and a long range project. This isn't something that is going to feed you today like day labour.