I agree, Star is paying (as well as earning :D) a lot for KBC. However, I personally feel that all the credit for making this show successful goes to Mr. Amitabh Bachchan. The angry youngman of three decades ago, has turned out to be one of the best anchors in the country.
Mr. Bachchan is a perfect gentleman (this time though a little modernised, coming up in leather jackets instead of sherwanis)..........and his grace touches all. His subtle jokes (which never cross the boundary of gentleness), his smile, and his speaking style.......and the phenomenal ..... sure........confident.........lock kar diya jaaye........is truely truely charismatic. Even, in one episode of KBC 1..............our dear SRK tried to vaguely imitate him.........but the original always stays.
Yeah, this is the show, that has pulled up Amitji from his dull days upto the topmost place in the victory stand. He is up there, like lady luck, distributing wealth to the wise. KBC has given him a different image, one which probably no indian actor was able to achieve.