[Him]

Well from what my friend has shown me many J-pop and K-pop bands love to emulate american style, albeit a few years behind. I think that's what get people to listen. That and the how well looking the actual singers are.

And yes, it always about making money, most bands tend to try and find out what works. As mentioned above the fashion and the sound of the songs are usually based on what's popular. They don't play over there, they do all the research they can and it's really a good outcome for them. Check how many people actually go to their concerts. It's insane!