I'm not entirely sure i'm grasping the point of your post, other than saying old equipment is still good but cheaper, which as far as i can see bears no relevance to my statement.
My point is that swapping about isn't likely to change much.
If for example, you were to give me a Nikon D70, Nikon D2X, Canon 350D and a Canon 1Ds, all the shots would be largely of the same calibre, with maybe a few technical issues like noise and sharpness varying.
A D2X/1Ds wouldn't automatically make my composition, light interpretation, setting choices etc. better than they would be on a D70/350D