I play both specs. MM is main spec on my main hunter, but I have 3 hunters and one is BM main spec.
I 'don't go miles from reality to defend it'. I was citing simple facts above. World #2 ran a BM on their 3rd clear, and world #4 ran one on their progression kill.
I personally don't actually really like either spec, but I am a hunter and play what Bliz gives me.
They have quite different strengths and weaknesses. And, relevant to the OP, as I said above, it is my opinion/observation that many 'average' hunters play MM poorly and would contribute more to their raid team in BM spec (more damage and better mechanics)