I used to volunteer with a group that built houses in Corbin, Kentucky. Certainly not a vacation, and I learned wiring over a few years of being there. But I still wonder what more could have been done if the money that was spent to feed, transport and house us was used to spend more money on building or, hell, hire people to do the work and create desperately needed jobs. And a mob of 50 of teenagers, most of whom have no idea what they're doing and have to be taught, isn't really an efficient way to do the work either.