The best way to put it I think, comes from my experience riding motorcycles. I almost ALWAYS am in full gear, full face helmet, leather jacket and pants, both with appropriately placed hard armor, leather gloves, race boots. EAR PLUGS.
The saying goes........"dress for the crash, not the ride", and "sweat washes off, road rash doesnt". Or something like that. For those 150 times I'll be soaked in sweat, it pays off for that one time I actually do hit the pavement, take a slide, and can get up and walk away because I was wearing the proper protective attire.
And yes, I have crashed 3 times on a bike. With nothing worse than a few sore spots.