People don't use Mac Pros. If you look at the userbase of Mac Pros and compare it to the userbase of probably any other Apple machine that's currently available, you'll find that it's much much lower. There's a reason why it hasn't been updated nearly as much as any other machine in their lineup. Apple isn't going to spend hundreds of thousands of dollars into R&D for a product that isn't being widely used. It doesn't make any business sense.
Even you don't have one as per your signature, yet you preach about it.
Well, I wasnt' really PREACHING about anything, I was just engaging in some light recreational banter centering around topics relating to a hobby of mine, for entertainment purposes. Good times.