This is not something music fans are likely to admit, but their tastes are determined more by shrewd marketing than by some "objective" measure of talent or quality.
It reminds me of an article I read recently - a world-renowned violinist played in the DC Metro for a day. Not a single person recognized him, and very few people recognized the quality of his performances. Most just passed him by and some dropped quarters as if he's just a run of the mill subway performer.
IMO, people do not have the discerning taste they seem to attribute to themselves. This goes for movie buffs, music fans, video game connoisseurs. Everyone.
So, in an environment where people's perceptions of art and media is more determined by preconceptions and biases than any pseudo-objective measure of quality, the difference between winners and losers is who can shape their image the best. This takes a shitload of money, spent in a shrewd way - record labels are still very, very good at this.