It's pretty strange, when you really stop and think about it. In most expressive arts we tend to value ability -- so why do the teeming masses prefer simple pop instead of, say, complex progressive music or speed metal, which, according to fans, require a lot more technical prowess from the artists? Why aren't little girls going to school with Yngwie Malmsteen backpacks (besides, you know, the very idea being creepy as hell)?
Maybe it's a marketing thing. Maybe the music has a wide generational appeal. Or, hell, maybe everyone is just flat out stupid. Or maybe it's because your brain is so hooked on pop music that it doesn't matter what you think.
Yes, pop music is basically cranial crack, to the point that scientists have actually been able to predict which songs would become big sellers by hooking kids up to an MRI scanner and playing previously unheard pop tunes for them. When a future hit came on, the pleasure center of the brain lit up like a Christmas tree.