It sounds as though your model is based on a Ponzi scheme. I don't mean to be offensive when I say that - I'm not suggesting you are trying to scam people, merely that your early "investors" (the first person to pay to read an article) will only get paid as a result of later readers purchasing articles they promote.

These later readers will have to find further readers in order to recoup their costs and perhaps make a profit.

The business model is decidedly pyramid shaped, which is usually only a good thing for the people at the top of the pyramid.