I think it just has to do with skill ability, and not being just another Page, Van Halen, Rhoades, Clapton, Hammett, etc...
I think its hard to find a guitarist who has his own niche, like Hammett finger tappin, Eddie's shreddin, Rhoades using classical music for solo's/rythem, Wylde's Squeals, etc.
Not everyone can be a John Petrucci, Steve Vai, Joe Satriani, Al Di Meola, and what not.