Yeah, it's the biggest pile of horse****.

That must be how the Tour de France is won (doping allegations aside), cause after all, you have 50% more available power on a fixed gear!

Riiiigggghhhhtttt.

And as far as why fixed gear? Because it's fun. The closest I can get to describing it is that it's like going down a smooth, fast river in a canoe. It really is fun.