They've stopped this practice, in part due to this article (note the date - 2013). I have friends who were journalists there at the time who told me about it.
> Bloomberg reporters receive bonuses based indirectly on how much they shift markets with their reporting. This story undoubtedly did that.
Linking the story with market moves can be legitimate, they are a business news org and market is moved by major investigative stories.
"your article achieved so and so? don't mind that, we gave it a journalistic valid prize, here is your money bonus"