Was thinking about making some sort of article directory, where the article directory is a revenue sharing site. When they submit it will go onto a highly SEOed page with one of the Adsense ads being theirs. However I'm not sure if this is a good idea.
I don`t think it is a good idea. There are lot of websites like this one and the competitors will be high ranked. Better try to find a real niche.
Directories usually get very little traffic or revenue, so people aren't going to care much about sharing a few cents.
You gonna have too many competitors. Just having revenue sharing would not do much help. Blogging is rather interesting and money earner if you do it right.