The channel did try to tap a number of controversial people, but it seems like, except Veena Mallik (who's also almost forgotten now!), they all turned down the offer. Of course each time they approached a potential contestant, word got out adding to the hype.
But publicity of any and every kind doesn't always help. The hype had raised the audiences expectations and they were expecting a dhamaka list of inmates which has not happened and they are left saying 'khoda pahad nikla chooha!'
Read more: Dull contestants in Bigg Boss 4! - The Times of India http://timesofindia.indiatimes.com/entertainment/tv-/Dull-contestants-in-Bigg-Boss-4/articleshow/6677730.cms#ixzz11JFOvSL6