I don't believe the lowest common denominator has anything to do with people. LCD gets ridiculously low results, and for 99.99% of integer sets the LCD is 1.
No, what you're looking for is the shape in the venn diagram with the largest surface area, which has no intrinsic value association.
Have you watched Mad Men? Creators specifically target the people that are easily manipulated for the sole purpose of making obscene amounts of money. The problem is the motivation of the creator, most things that are popular are created for the specific purpose of making money. This is an issue of credibility and integrity. When I support things that have this motivation I don't feel as good as supporting something that is trying to say something new or is the original/uncompromised vision of the artist.