How are CC's not art?
Art is:
the expression or application of human creative skill and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power.
CC is expressing and applying his creative skill and imagination in a visual form as a sculpted key cap, and judging by the amount of pictures in the post a picture of your cc thread, its appreciated a lot for its beauty. Most people put them on keys that they don't frequently use, thus making it less practical and more artistic