Actually, there are more OB-lovers out there than you might think if you include electrostats (Martin Logans, Sanders, KLH9s, Quads) and planars (Maggies, Infinity, etc.). All are open-baffle.
I had every one of those designs at different times in my life and enjoyed them very much. Now I have a GR Research OB design (LS-9) with an array of cone woofers and planar mids/tweets and I enjoy it even more. It has impact, soundstaging, depth, clarity and a degree of realism that I had never experienced before. Everyone who has heard them agrees that they are something special.
I go to several audio shows every year and I marvel at the fuss audio reviewers make over what my ears tell me are not very good sounding systems (at definitely ungood prices).
I return from the shows, crank up my system and go "A-A-A-H-H-H-H!"