I have one on my desk at the office. SMC motherboard, dual Xeons, NVIDIA cards, LSI RAID card. "Only" 16 GB RAM though - it isn't for production but for prototyping and testing. It cost far less than a "loaded" Mac pro - even with Win2K8 or Win2K12 installed.
I build and ship these things all the time. With the Mac Pro you're paying for decor and the ability to run OS X without resorting to hacks.
Lol...why lie? Please show evidence. Every time I've tried I always come up with equal to or more expensive.