Celebrity look alikes?

While having a play about in the internet, I came across this website. I spent ages sifting through the endless photos of people who make a living out of looking like famous people. It is obvious that some of the people featured have natural similarities to the celebrities, but some apear to be pulling out all the stops to try and look the same. In my opinion, the Jordan look alike has to be the worst.

Is this just a harmless bit of fun, or celebrity obbsession?