Well, Elzetta is new, and expensive, hence the lack of interest. This is compared to Surefire, McGizmo et al, who have already built quite the fan base.
Peak... great lights, poor aesthetics, terrible website. I agree, if their website wasn't so terrifying, they'd be more popular. It doesn't help that Peak lights usually look like plumbing fittings, either. But they certainly are awesome lights...
Inova... solid, but boring lights. No lego capability, single stage only, and no ridiculous lumens outputs. Mind you, that makes for a great user, but not so much for talking points.