Rappers who incorporate Mafia or OC into their stage names/image are doing it to appeal to the people that buy their product.The largest segment of their fan base,and most desirable demographic, is suburban white males. Lots of these kids (and young adults) are wannabees,whether it be gangsters or gangstas. They are the ones that buy the CD's,the clothing,the bling, that drives the business.The rap culture is heavily reliant on crime and violence as their marketing strategy and it doesn't matter if it's Capone or Scarface,or Matthews,or Gotti,the nitwits with money will respond. As the French say "a fool will always find a bigger fool to admire him".