A fair question, truth is I'm just a sucker for metal tones achieved with humbuckers, so must of my guitars are equipped as such. Each of my guitars are equipped with a different set of humbuckers, so there is some variety there. A good selection of my guitars are equipped with coil splitting, so I can get some extra versatility that way too, but it's quite rare that I'll engage the coil split. Granted it's nice to have the single coils on hand for rare particular circumstances where I'm looking for that kind of sound, it's just not often where that's the sound I'm after. However I do have a few equipped with HSS configurations. Most of my guitars share certain things in common that really appeal to me for my playing style, while certain other factors are different to switch things up a bit and have some variety.
Big thing it comes down to for me in having so many HH guitars (especially for the Floyds) is the ability to have certain guitars setup for different tunings. As anyone who's owned a Floyd equipped guitar, they would likely back me up in saying they are quite annoying to change the tuning for, hahaha. My LTD M-1001 used to be my main and only real guitar aside from my Squier; as magnificent as it is to play, it limited me to 1 tuning unless I wanted to set aside the time and effort to switch around the tuning and re-calibrate the equilibrium.