Why are common people so Interested in Celebrities personal life matters?

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This is something that has always intrigued me. We normal people are so much interested in knowing all the Celebrities personal life matters or gossips going around... Has anyone done any research on this topic? I am sure there must be some student in big IVY league colleges doing some kind of research on humand mind to analyze why exactly people take so much interest in other people's life!! Now this is NOT any country-specific MANIA!! People all around the Globe behave the same way (atleast the majority of them).. evening after I come from work..switch ON the TV and what do you get to see in the idiot box.. there u go... Insider, ET entertainement all these gossips with very less actual footage content. Most of the time they just keep showing Ad's on what's going to come NEXT on the show..and when it finally arrives.. BOOM...turnes out to be a no-news at all... So I just want to ask everyone? Are we ourselves to blame that we encourage these TV channels, magazines to cross their line and intrude into celebrity privacy..? hoping to hear some good ideas on this...