In reality shows as in drama shows and novels and plays, it's conflict that's at the heart of the story. Reality shows use editing tricks to create conflict even when it's not there. I think you'll find this Videojug.com amusing look at reality show editing interesting (there are some good tips in here for any kind of fiction writer):
You may also be interested in the previous post about the business of Reality TV (what networks look for, how such series are bought, etc.) and the one about storytelling in supposedly unscripted shows.
(For friendly guidance in writing your own book, screenplay, or even semi-scripted Reality series, see my book, "Your Writing Coach," published by Nicholas Brealey and available from Amazon or your other favorite bookseller.)