Airlines use simulators to reduce thier expense while training pilots. ATC does not use realistic simulators for training because it would cost them money. Using live traffic for training cost the airlines money not the service provider. It has been one of the biggest failures in ATC in my opinion. I have seen the system users punished so much by unneeded delays and potential mishaps while low hour ATC trainies try to get the flick. When you talk to management about it they respond they dont have the resourses to put an instructor in the Dynamic Simulation Lab with a trainie. But seeing the Trainier is working a live traffic position already putting a trainie with him/her cost the service provider nothing. They dont care how much it cost the customers paying for the service for unneeded delays. Just ask the pilots over MVA last week how they liked thier RA at FL300 head on. Just another day with a trainie.