I think it has much to do with promotion and advertisement, it requires more business talents, then artistic.
You need a good manager, a famous label, people who really want to turn you into cash.
Most famous bands aren't really great musicians or players anyway.
Most of time they play for a big ignorant audience, who would not even notice a tone change.
And this audience is expecting more of the same, which ultimately kills creativity.
Jumps to my mind Linking Park, Bon Jovi, Coldplay.
Rush, what musically poor stuff they made since they entered the hall of fame.
And then Managers tend to impose an "Image"
Something that captures the attention :
Jumps to my mind - Ghost - really pushed forward to win prizes they don't deserve, considering the level of art.
Prizes specially made for hidden promotion.
Like an Armani catwalk.
Finally it's about keeping your soul, not selling it, making the music you feel you need to play,
and not play what most people want you to play.
So not becoming famous is really something to be proud of,
being recognized by musicians is much more rewarding.
Jumps to my mind : Eric Johnson