The big problem is that any writer who knows how to write articles that will make you money also knows how to make money via his own website. He will not work for less than he'd expect to make himself - why would he? The days of the uninformed exploitable are over. Once past the initial hump of "desperately needing cash," a web content writer becomes well tooled to be his own entrepreneur.
That, of course, is a generalization, as many good writers are as yet unaware that they're just a couple of steps away from being successful webmasters, too. But that's changing.
I have this weird vision of the future where it's not just entrepreneurs who hire writers and website designers, but writers who hire website designers and entrepreneurs and designers who hire writers and the vision people...in this fearful new world, it's hard to see who's going to end up exploiting whom, hmmm?