Thanks for the share, Brian. While promotion in the form of advertising can be a good thing, I really would stray away from paying for advertisement on Facebook. Almost all paid advertising on Facebook results in "likes" but not valuable likes that actually interact with your posts. In fact the corruption and fraud in Facebook advertising goes so deep that even if you don't pay for fake likes or advertising, your Facebook pages can receive them anyway from people who are paid to like things, but like other pages in order to hide their real task of liking a specific one so they don't get caught.
I've only brushed the surface of a response, but this video covers the subject with some in depth research, very well. https://www.youtube.com/watch?v=oVfHeWTKjag
Hope this sheds some light on that as well.