hang on, I think you made a couple of typos...surely you mean "12 months" instead of "2 weeks" and "half" instead of "99.9%," right?
Quadro cards are not practical for anything except 3D work. Even then, their value is questionable. Most high-end consumer cards are updated so often that you can get one that's faster than the equivalent Quadro and will work even for most 3D pros' needs, while still costing 1/3 the price.
If people wanted to built a PC, they wouldn't be on this board. The Mac Pro IS a PC. With boot camp, a copy of windows, and an 8800 GT, it's the first real "gaming" mac in years. I need one for work, but when I'm not working, I'd like it to be able to handle any game that you can download on Steam at 1920x1200. There are probably more people like me than there are people like you. Try not to be too shocked...the average "gamer" is now closer to their mid-life crisis than to their first day of school.
The 1900XT that was the only non-Quadro BTO option for the Mac Pro until this month is one of the loudest graphics cards I've ever had the displeasure of being around.
I don't think Apple gave any particular attention to that element.
Also, the 1900XT is a power hog and runs too hot.
I'd say it's the worst mid-high-end graphics card since the nvidia 5800 series. And that's saying something.