The price limits the interest of the 5D Mark II, the Nikon D700, EOS 1D series, and Nikon D3 series; all of those bodies each, individually, account for less than 0 percent of the sales for Canon and Nikon. The vast majority of d-slr sales are in the Nikon D40-D60-D80- level, and once the prices go over $1,000 the individual models sell progressively worse and worse.
Just as an example, this past spring, a Nikon Europe vice-president announced to dPreview that the D40-D60 class represented, "over eighty percent" of their d-slr sales. In 2008, I saw a breakdown on sales figures; the world economy has dampened sales of $2,500 cameras pretty badly.