It's all about ratings (same reason Fox cancelled brilliant Terra Nova)
How soon until Britney makes a bad decision like Nicole, and get's replaced for upsetting Simon... and viewers?
...in the UK the contestants were caught performing rehersals in pyjamas I think, before they moved there to US eyes;)!
Daily Mail | 'Lounging around all day in pyjamas bored, wearing slippers to rehearsals: Meet your Slob Factor finalists' by LUCY BUCKLAND
UPDATED: 15:21 GMT, 20 October 2011
New York Daily News | Britney Spears may join 'X-Factor' in $15 million deal' by RICHARD HUFF / NEW YORK DAILY NEWS Wednesday, April 11, 2012, 7:51 PM New York Time
"If a deal is done, she’d fill one of the two seats left open after Cowell cut loose judges Paula Abdul and Nicole Scherzinger after the first season.
A Fox spokeswoman said the network had no comment on the reports. A spokeswoman for Cowell said the same.
“The whole idea is to get eyeballs in front of the show,” said Brad Adgate, senior vice president at Horizon Media. “When you look at the big name judges, you think of [‘The Voice’ judges] Adam Levine and Christina Aguilera and [‘American Idol’s’\] Jennifer Lopez. He’s been searching for a blockbuster name that’s gouing to draw in viewers, particulary young viewers.”"