Develop your own style. Set fashion don't follow. No one ever made a be for themselves by producing more of the same. Commercial crap it comes and goes but the legends are forever. (Tupac parody)
I'm sorry but the above statement is absolute nonsense. Many people have made a LOT of money by producing more of the same. It's basically how the music industry works.
After Nirvana - Every label wanted a grunge band
After Spice Girls - Every label wanted a girl band
After Avril Lavigne - Every label wanted their own angsty teen pop/rock chick
After Creed - Every label wanted their own post grunge mainstream rock band
That's a tiny subset of example but it's basically the engine of the music industry.