If you're a good self-promoter you might be able to bump your revenue share considerably. However, if you're that good at self-promotion, you're better off putting what you're writing into your own blog and self-promote the hell out of that.
Again, if you want writer credit and aren't interested in non-fiction as a career then you're better off submitting short stories and hoping for a bite. There's plenty of markets out there and anyone with time to write endless articles are better off targeting these, as it will at least get your foot in the door (I know 3 short story sales to a SFWA approved market can get you into the guild, which then gives you more direct access to publishers and agents, allowing you to side-step the slush-pile).
Personally I don't hold much weight in these companies. If you want to make money from your living room, then good for you, however this isn't likely to move you or progress you. It's just a lot more honest than the other companies out there that don't revenue share and don't share credit. The whole idea is that ghost writers get paid more for being known less, but in these kinds of markets the opposite holds true.
I mean, once a university lecturer drops off the tenure track, where is their career progression?
The web-sourced job world cannot offer a career track, it can only pay for the quality of content you produce now.
Indeed, what occupations today offer a career progression for many on their track? Any occupations that are offering this are in-line for being disrupted by web-sourced content.
It's one thing to work like a dog for little money for some chance at success... it's another to do so without any opportunity for progress. That's what makes them a sweatshop, imho, whether or not you can work from your living room.