Not gettong caught is obviously your first line of defense. However, 75% of avy deaths are due to suffocation. Airbags greatly reduce your chances of being buried. If you get caught in an avy above a significant terrain trap, there's a good chance you're fucked regardless
Yeah, they're expensive, but if you got caught in an avy you'd probably give everything you own to have one at that moment. And like was mentioned earlier, they're not as pricey as most factory splits.