You're quite right, of course - but there's a minimum to the technical quality that any of us are prepared to tolerate.
and that 'minimum' was probably reached way back when the 10D came out. My dad can't tell the difference in quality between the pics I take on my own 30D and work's 1d Mark 2n, and thats because for practical purposes the difference is bordering on the imaginary. Sure, whip out a magnifying glass and you'll see the difference, but please, photography should aim a little higher than that level of pedantry, shouldn't it?