There is no more wrong with jazz than there is with any genre. Some good, some mediocre, some bad. What is good or bad is decided by the listener because that is his/her world. It all boils down to taste. When you mention sales statistics is just goes to show that people are not buying music to listen to, but as background noise or group experience, or just to dance to. Like the tv in some homes, it's always on but nobody watches.
You don't need to be a musician to be able to listen to music, but you need to be able to listen.


Chris