^ Yup. That's the key to any girl/boyband, actually. If each of their five to fifteen members (or, in this case, fifty >_>) have even a few thousand core fans - which they will, because even the 'lower' soloists and such can easily sell that much, and they aren't even a group of mass produced products! - that's already a great start, considering friends and family will also be guaranteed to buy some, along with what ever casual listeners they get. It's also a great help that these groups are usually idols more than anything. I mean, look at those covers, for instance..... Like I said, lots of guys will be all over that, lol. Though, it is a little more amazing with female groups, because even though you can technically appeal to men easier with women, girls are the ones who become crazy obsessed fans.