`` Jersey Shore '' star attracts crowds at CES promoting line of headphones for iHip . By Analyst : Celebrities bring short-term buzz but are no guarantee of long-term sales .
`` Jersey Shore '' star attracts crowds at CES promoting line of headphones for iHip . Hip-hop star 50 Cent and pop singer Justin Bieber also on hand to push products at CES . Analyst : Celebrities bring short-term buzz but are no guarantee of long-term sales .