Originally Posted by ptack
It's all about the money. Audi knows it can't sell RS cars in the US at anything remotely close to as much a profit as they can get elsewhere in the world. The US is too competitive a market and Audi/quattroGmbH is waayy too inefficient a manufacturer to step up the volume and lower the costs. You have to see the RS line not at a product line, but as a marketting tool.
You are so far off the mark it's unreal. Inefficient is something I wouldn't call quattroGmbH, currently Audi as a company are spending far more in R&D than either BMW or Mercedes, the reason for one niche Audis in the US is they have always producted limited numbers of the RS models up to now. Whether this will change is unknown, I did hear that they intended to develop and market their RS models sooner and in greater quantities but this was prior to the economy hitting the floor.