I think it's because I like to have some sort of truth in my image, I don't use Photoshop, and I don't understand how to manipulate images in that way, I do know that I like the image to appear the way it is on film on the screen, with chrome's I can look at the image and make sure that the scan matches the actual chrome on a lightboard that's in front of me. Also there's sort of this I don't know how to explain it but it's a look, I can usually spot a chrome over some other version of an image simply because of the special look, I think it's the way the black drops off in the shadows and gives a sort of definitive line to areas of the image almost like a drawing when the artist from say a comic book, has to outline things with a black ink first.
I also like the saturation, I tend to personally do a lot of long exposure work with my chrome's, and in that situation I have not found a way to duplicate the kind of saturation that I get with a chrome in digital form without it looking really poor.
I also certainly can't get the same look with C-41 film, not even EKTAR100 will match my chrome images, and I've only seen one image made by Polyglot on Ektar100 that ever matched the kind of look I enjoy with film.
Because I don't print optically, at least not yet, I enjoy shooting the crumbs and then scanning them much better than I do shooting color negative film and then scanning that.
Perhaps someday when I start to print optically, I'll regret not having the originals on a different type of film, but I just love the results I get, and the power of looking at the images on a light box.
I started to consider maybe switching some of my smaller format onto C-41 but still shooting the large-format chromes, there's nothing like seeing a 4 x 5 color chrome on the lightbox is just so amazingly powerful!