They require a good bit of thought, planning, and labor, and you don't get to buy "the right stuff." And let's face it; this is a consumer hobby.They are usually not in the room … Invisible... So why aren’t they more popular?
I mean what's more fun? Going down to the high end store and buying a couple (or more) of Deep Supreme Luxinators (given 5 stars by Audio Intelligence Online), taking them home, plugging them in, then posting on WBF about the palpable expansion of your sound stage, or cutting a hole in your floor, building a reinforced plywood box in your crawl space and hooking it all up to a couple of dirt-cheap pro audio amps and an equalizer that your buds will look down their noses at?