Just broke my vertebrae in two places falling off a 30+ kmh wheelie, due to a tiny bump in the road making my rear wheel loose contact with the ground. Bad luck, but could have been avoided. It was also my first time falling off a wheelif after years of exp. Tips:
Lower your seat a bit, makes the fall shorter and bailing easier. Dropper post is nice for this.
Practise bailing.
Use c2 grade d3o armour or better.
Don’t go at high speed unless you have years of exp. Esp not on hard surfaces.
Always use flats.
Know the surface, don’t do high speed wheelies on unknown paths/roads.