Hey,,
I think that someone had an idea, which caused the creation of Robot Wars. The popularity increased, which spawned new shows to develop and take a peice of the pie. Most of these trying to be original, but in the end, it is all the same crap.
They are not on the forefront of robotics. They use a lot of proven technology with nothing too experimental. If you want that, you should see autonomous robotics competitions.. That's where you see the cool stuff
Steve