Well it's not going to game better than many other, significantly cheaper options. The scaling isn't going to be good at all. I'm just saying it's a waste and the only reason to do it, the only reason - is to show off. Much like driving a Ferrari in northern climates with long cold winters. It's not like you can ever really stretch it's legs, it's just to show off how much of a baller you are. In fact most of the people I see driving nice cars are terrible drivers to boot.
I agree, hey, if it's just a drop in the proverbial bucket, why not spend all that cash for fun? Sure, why not? But realistically it's just not a good option. If I was going to drop thousands and thousands on a PC, I'd top it out at dual ASUS ARES. It's known that CF and SLI don't scale very well past 3 GPUs, and dual 5970s are already at 4 and notoriously have issues even at that number. Going up to 12 GPUs couldn't possibly work well and no matter what game you're playing, no matter what CPU you have, it's going to be bottlenecked either CPU or bandwidth wise at that point. It's worse than the Ferrari analogy. At least you could hit a deserted highway in summer and have some fun. The PC's only way to show off would be topping out a PC Mark score chart or whatever. Otherwise, most of that power is useless and unuseable even at his super high resolution.