It took a while for someone to hit the head of the nail. It is all about price points. If you load up a frame with high end components that push it over say $8000 you are cutting down your potential market quit a bit. So you make it a $5000 price point with components.

I have always thought you should start with the best quality frame you can afford, wheels next and then the drive train. Other than weight and bling is there really that much functional difference between 105 and DA? It does bug me however when you see a very high end frame with the lowest end wheels out there.