If a new well which might have cost $900 to put in is so good for the villagers, why can't the WHO and other people who get our money show thousands upon thousands of such wells in villages everywhere?
Reason: they don't want to spend the money on low and slow style projects, they want the big win, high dollar stuff.
Also to install that $900 well, they have to line the pockets of corrupt government officials to the tune of several thousand dollars.