Popularity

Just because something becomes popular doesn't mean it looses its value. If that were true, nobody would listen to punk music, nobody would read Hunter S. Thompson's work, and nobody would like watching Pink Floyd's The Wall. Things that seem to "loose value" after becoming popular probably had little to no value to begin with, and really only had a single purpose. I'm going to use the Backstreet Boys as an example. The only purpose they had was to be popular. They had no value as art because they were practically born into pop culture. Hence, when that scene died out, people had already stopped caring about them long beforehand. Now let's use Radiohead as another example. I think it's pretty safe to say that they are a highly artistic group that had to earn their right to become popular. And after they did, their value didn't drop, because they were something authentic and original. Now, while it's completely unnecessary, I'm going to jump to Coldplay. Coldplay is clearly a cheap imitation of Radiohead (one of the band members basically admitted that). Since they lacked the originality of Radiohead, they had less value as artists, and hence, they haven't been able to hold the music industry's attention anywhere near as well.