I would say the commercial success of an album to a much broader audience is generally considered by the original fans of the band a "sellout". That they catered to the producer's, etc, desires to create a commercial success that varied in style or content in a manner not appreciated or liked by the smaller group of fans that originally followed the band. I don't generally put a lot of stock in this as many bands, or artists, evolve, or mature, as they create more and more material. Sometimes it appeals to more people somtimes it don't. The black album was different and more mainstream than previous albums. Did they just come up with different material out of boredom and creative expression, or cater to the "man" who demanded better sales numbers?