At my gym, there seems to be a 50/50 ratio of guys that spar at 30-50%, versus guys that spar at 80% or more.
Some guys just beat the hell out of me regardless of how many times I tell them to calm down. Being 20 lbs or more lighter than everyone doesn't help, either.
And that's why I just ordered my TWINS chin+cheek headgear. Better safe than sorry, right?