I am nosy. Or more than nosy, criminally nosy. I found out that my father had been cheating on my mother (this is long time a go, they have worked it out, thankfully) because of my extreme nosiness. Learned my lesson though... I would have preferred not knowing, and since then I try to tell myself "it's none of my business, it's none of my business..." everytime the nosiness monster shows signs of waking up again.
Another thought: maybe I like reality TV so much because it satisfies my inner nosy person, and I do not need to be nosy about people in "real life".