Why do you care? They are doing a good thing and having traveled and done mission work in a part of Africa where people are lucky if they get new shoes every 2 or so years i have no problem with this.
to explain, those Nike's/Reeboks/Expensive Shoe you wear and get new ones every 3 months because they fell apart? They have to make those last in a very brutal rocky environment.
So shut the hell up and appreciate the fact that someone out there has a kind heart and is willing to help.