Man, that list bums me out. Foo Fighters and Beasties couldn't even break a million? Blink is just about halfway to Gold. Absolutely nuts. Rock truly is the worst genre to even think about going into.
Do people think about getting into a genre of music as a performer? I don't think that's usually how it works.
Also, who buys the Adele album? Just turn on the damn radio, most stations have at least 2 tracks by Adele in a 10-song rotation, having the album itself is almost a moot point.