Because it's popular, it's a simple as that. If Westlife make a record, and 59 million people in this country hate it, that's unfortunate for them, but if the other million buy it, that's a result! Any commercial artform will appeal to the lowest common denominator in its audience. 'Big Brother' is hardly art, but it is hugely popular, and that is what they creators are looking for. Pop pap always has, and always will sell massive quantities, you just have to ignore it and pursue your own taste through slighly less obvious channels.