The idea of urban just really do it for me. The time required for setup, under the pressure you are going to get caught, to hit a rail that probably isn't better than one you can get in a park, all with higher chances of getting hurt. Plus you need a crew willing to do all of the above as well. and if you get real serious it becomes a whole production requiring, lights, winches, drop ins and torches.
Don't get me wrong, watching pros hit stuff is awesome, as long as the feature seems worth it, but I personally have no desire to go through the work.