I've got no interest in playing multi-string, extended-range guitars, but I've got no problem with people who do. If that's what they want to do, the sound they hear in their head, then good luck to 'em.
I really don't think it's an ego thing, "look how many strings I've got". Except perhaps for a tiny handful of total morons. Charlie Hunter, Tosin Abasi, even Rusty Cooley.... these are good, talented musicians, even if I personally don't enjoy what they do.
(Hmmm, can't believe I'm sticking up for Rusty Cooley... :| )