I do believe that the very simple math you have used has some huge potential flaws in it. Anyone could post 10 articles in a day of similar quality and have wildly different results with each one depending on a multitude of factors. Beside the fact of posting such quantities may in fact bring down the results for all the articles anyway.

There is also a multitude of other factors that play into your income. Such that if your theory was accurate after the 30 days you would be earning significantly more then $3,000. That is because an article likely would not stop earning after just one day. But this point is not significant because of the unpredictability of success of any one particular article.