I have nothing against people playing Blood.
I do have against those who claim that Blood is equal or better than Frost or Unholy, and is the only reason i argue on the topic.
As i said it before, if you want to play a "fun" spec (altho, spamming HS 24/7 does not seem like a fun thing to do if you ask me, but ok), and your guild is willing to carry that load, and not take something more usefull, than feel free to do so.
P.S. Its funny how you chose THIS EXACT topic to try and prove something, where a dude that originaly made it, says T8 is better than T10 for Blood.
Oh, you can also go play TwoHanded Frost Spec, if you have a Shadowmourne and want to do less dps. Atleast you will bring a usefull buff to the raid. :D