A few years back I was reading reports saying that car theft had dropped substantially as it was nigh-impossible to move a car without the key, to the point thieves were even resorting to breaking into homes to get the car keys.
These guys should not be stealing cars, they should be selling replacement keys if it's that easy.
Unfortunately thieves always seem to be a step ahead and figure out things like location of CAN buses to connect diagnostic equipment and clone keys that way, that's why you sometimes hear about cars with ripped out headlamps because there is a CAN bus connector behind them.
Meanwhile, I can't get a spare key fob for my 11 year-old Prius without paying the dealership $524.66.