Why not more popular?

A couple of years ago, I got my first set of open baffle speakers. I've owned a few pairs of Magneplanars and many box speakers over the years, but my current speakers are the first true open-baffle speakers I've owned. 

I am absolutely smitten with the sound. Musical, dynamic, powerful, and an amazing deep, open, airy sound stage, with none of the weird boxy resonances or port huffing that I've heard from so many box speakers. 

What I don't understand is why there are so few speaker companies making open baffle speakers, and why are they not more popular among audiophiles?