Novelty rappers?

What happens to novelty rappers when their 15 minutes of fame (or shame) is up? you know, rappers like Kelis (milkshake, bossy), Jibbs (Chains hang low), and Mims (this is why I'm hot). Do they go back to da hood, or do they star on another reality tv show no one watches? where do these novelty rappers go when their 15 minutes of fame are up???