If the beauty of grain/ noise is to be justified let's study these samples:
This photo was specifically stylized in Photoshop using the Graphic Pen action. In a downsized image it looks like a very grainy photo and the original didn't look anywhere near as atmospheric as this.
This photo of a dark passage is nice and grainy, not that it would be noted in a downsized image.
Grainy again, but the appearance of the photo doesn't scream 'artificial'.
Ah hah! Tricked ya! This was taken with the 1D Classic, not the 1Ds.
Point is: grain can be lovely if used carefully. If you don't like ANY grain or noise whatsoever, then don't buy the 1Ds or 1D. The vast majority of people prefer to shoot without being tied to using a flash or a tripod, and so do I.
For this reason the noise levels of the 1Ds are immediately exposed and are perceived as a flaw. Expose properly (and more importantly, avoid underexposure) and light your subject properly. Compose well. Catch moments. Do all these and your audience will love your pictures, grainy or not.
Maybe I'm a little thick in the head, but I still don't understand why noise levels are the be all and end all for such a big proportion of photographers.