Got to love a thread that has car crashes, beer and racing all in the discussion topics.
I put fully functional roll bars in as I had seen a video of a cobra roll over and they took the driver to the hospital - the roll bar had collapsed. I think the video is still on youtube.
The car was going to be a "fun day at the track" idea and then I got in with this bunch.
Now it is a drive when the weather is nice type car.
Roll bars - you have to decide if they are an appearance item or a safety item. It would be a bloody shame to not make them functional and need it/them later in a roll over.
Your stats are interesting, they should not be used as an excuse to not put something in/on the vehicle.
Just my $.02 worth.