I think snare heads go with people who hit down into them as opposed to rimshot or near rimshot parallel hits. Often folks who sit up high with the snare down between their legs in a position where they couldn't hit a rimshot if they needed to. I've never busted one either. But it's such a vital thing, that I'm prepared.
In my guitar days I had a spare guitar on stage in case a string broke and a small SS amp head in my gig bag that had serviceable sound in case something happened with the primary tube amp. Along with cords, tubes, fuses, tools, etc.
If I'm doing more than just drums, like I've got the PA as well, I bring two flashlights. They always seem to be somewhere else when you want it.