And if no, how come so many people walk off bb then? (including celebs)?

Off the top of my head, Daniella Westbrook, Brian Harvey & Natalie Appleton left.
Prob more in later series as I lost interest

Series 6 was one of the only series where noone walked out.

People who walked are Daniella Westbrook, John Lydon, Brian Harvey, Natalie Appleton, Elaine Lordan and Kimberly Davies (who was injured)

I suppose the difference between BB and I'm A Celeb, is that the celebs get paid, and apparently get no fee if they walk early.

i dont think you can count Kimberly Davies as when she jumped from the plane she hit the water and broke her ribs,she went back into the jungle but found she couldnt cope on the beds they provided, which wasnt surprizeing,i seem to remember it being on the News asking the question if the program makers were asking the celebs do 2 much as they are not stunt people,she was a very gutsey girl

Johns Lydon did

The property developer Johnny Rotten walked.........

He got his publicity then stamped his feet, pouted, swore and walked off like the rebel wot he used to be

But he don't currrrrrrrrrr...............