I was part of a test day for a reality show, and have a friend who worked for months as a coach for n MTV show. It's awful! Not just the constant filming, you actually get used to the cameras relatively quickly, but the manipulation. They call it "reality," but they coached me on what to wear and what to say. My friend on MTV said that they threatened to fire him if he didn't use offensive language with his students, because they knew it would create "good drama" for the show. I would never do it again. I know many entertainers who have gone on reality contests, and they have all had terrible experiences, on of them wrote this blog/essay about it, if you'd like o read more: http://whipchick.livejournal.com/2012/04/10/
Reality tv is not real, it's all the stress of needing to play a character, without the Hollywood pay check.