I did an oec course and the instructor had years of experience with explosives in North america and europe. He told us of 3 or 4 patrollers who had been killed by mistakes they made, and in one case a faulty charge that killed two people. Extremely high risk for one or two people to use in the backcountry, just to clear one run for themselves. For resorts or DOT it makes sense (terrain is definitely closed when bombing, more people/revenue will be able to ski that area) but I do like the idea of a rechargeable compressed air powered charge.