Well, based on how the world looks like today, you have to sell-out to become popular (and that's what pop-music is, popular music). Do you really think that pop-bands like Westlife, U2, or even older bands like Rolling Stones or Beatles would still play if they didn't get much money or attention? The goal with pop-music is to get famous all over the world, and to get rich! Great famousity nowadays are gained by charisma and the way of acting, and not by the means of deep music. Sure, there may be bands that do create good music, but then in order to get famous and popular they have to follow the trends and sell-out themselves. That's why I say that pop-music is a sold-out genre...
Though, if there wasn't any trends or not any money, then the genre "pop" would have another meaning, at least for me.