Now logistics: you need space for cameras lighting and crew to move in. No way in hell is a multi camera show going to be shot in a real New York apartment kitchen. Walking through a real living room would have the camera operator bumping into all sorts of things. So homes and sets are huge. They aren’t filming bathroom confessionals.
You mean 'actors are more' (no need for 'sitcom').
Most people in entertainment (maybe with the exception of musicians and radio personalities) are more attractive than normal people.
What I always find interesting though is when a prisoner is played by an actor. That is a big paradox.