ARTICLE: WHO Backs Free, Treated Mosquito Nets to Prevent Malaria, By Stephanie McCrummen, Washington Post, August 17, 2007; Page A15

Easterly makes a great point in "White Man's Burden": when netting is given away for free, people often misuse it for fishing, wedding veils, etc. When a small fee is charged for it, people use it for what it's designed for far more often. The lesson? When you treat something as cost-free, people see it as worthless and thus employable in any fashion they damn well please. Put a small cost on something, and people want their money's worth.