So what is the problem here.... That Beyonce 'only' released 4 albums in 9 years???? Or that she milked every album as much as she could to make her album sales as big as possible?
Coz last time I checked the one making her eras last 3 years was Beyonce... which means she promoted 100.000.000.000 times more and still... Got to sell less albums in more time. NO MATTER HOW MANY DIFFERENT ALBUMS SHE GOT OUT.
Actually... I believe its much harder to sell a whole new album every time than holding an era and a sound that is successful.