Curious since I always get annoyed by all the "fender vs. gibson" threads. To me they're kind of irrelevant. At least in the metal sphere (virtuoso instrumental guitar, 80's metal/hair/thrash, prog, neo, djent, death, etc), ESP/Ibanez seem to dominate, with other traditional "metal" contenders being Jackson, Schecter, Dean, BC Rich, Kiesel, Musicman, even Agile and Legator, and the majority of boutiques are all metal-oriented, Strandberg, Solar, ormsby, aristides, mayones, skerveson, Caparison, etc.
I'd say there's probably tons of boutique builders out there who do a lot more than metal oriented stuff. Even Frank Falbo was mostly an acoustic builder as far as I know prior to the Abasi thing. There are builders that specialize in non-metal guitars in addition to Metal-oriented like Suhr as well.
Sure Yngwie plays a fender, but you gotta have his violin vibrato fingers to make it work, and the rhythm on it is pretty flubby.
Can't say rhythm playing on a Strat with humbuckers is inherently any flubbier sounding than other guitars with the same scale length and string gauge.
And Mustaine just switched to Gibson, but I'm sure that's a money thing.
But it still seems that Fender, Gibson, PRS seem to still dominates sales, I'd assume most of this goes to Pop/Session musicians, country, blues, etc.
So I just wondered how big a chunk of the overall guitar market "metal" represents.
Same would go for amps, with fender/vox/vintage marshall dominating over the more metal offerings
I'd say people go with the "Big names" since they're time-tested and reliable. You can walk in to any music store and get a Strat or LP. The "Metal" brands often don't just do metal stuff like Ibanez and ESP, they offer tons of traditional gear.