The general idea is a conflict of interest. But, I am searching for an adjective or noun that describes this sort of behavior. All I can think of is self-serving or egoistic. Any thoughts?
unfairly prejudiced for or against someone or something.
"we will not tolerate this biased media coverage"
(Copied from Google's definition of the word)
Or a person promoting their vested interests
a special interest in an existing system, arrangement, or institution for particular personal reasons; the persons, groups, etc., who benefit the most from existing business or financial systems
Another good word is shill. A shill is someone who promotes a product, for instance, leaving a review on Amazon, while secretly being affiliated with, or paid by, the sellers of the product.
From dictionary.reference.com, second definition:
a person who publicizes or praises something or someone for reasons of self-interest, personal profit, or friendship or loyalty.
In the technology adoption arena, the term evangelist applies.