i know from another "popular" car show that the producer calls most of the shots and the actors are just that. if you aren't causing enough semi-scripted drama or have issues with the main actors they will replace you in a heartbeat. its all about the story. cars, houses, food, travel, doesnt matter. just something to get you to tune in next week
that being said, i would rather watch paint dry and then eat it than watch more than 5 seconds of anything with MW.