I think the argument for hating those "sellout" bands is that you come to hate the band you once loved. Whether they change their style or sign with a major label and get tons of MTV airtime, you liked them for a reason. It may have been because of their originality, but that will eventually be erased by the fact that a label can pay the band to make the music that the label wants to hear. I think, though, as long as the band is true to itself and doesnt compromise as far as their music goes, then whoever calls them a sellout can take a flying leap.