Survival skills are never a bad thing...these skills would be a lot more valuable to your child if they are ever lost in the woods than geometry will ever be. However, I guess if you believe your child will never go camping, drive along a deserted road, or travel to a ski chalet, then it makes sense that one might think they are a waste of time.
While you may believe these experiences are a waste of time and money, many people believe differently. For some children, this is their first real exposure to nature. I wonder how many children end up choosing a career in geology, natural sciences, forestry management, or tourism, after experiencing these types of programs? Whatever happened to raising well-rounded individuals who not only learned theory in the classroom, but had hands-on experience as well?