That's actually a valid point, though if you have a charity organization taxation might take a toll on the money donated. Pun intended.
Let's look at some charitable organizations. For example, Comic Relief, they are organized in Britain but help the countries of Africa. They chose Britain, because it is their home country and also because they will collect more money here than if they will create in Africa. Although, England has problems with which the charitable foundation could help too. But...
But they're under BBC. It would make no sense if they opened up somewhere else. BBC provides them with equipment and people. What I was talking about is any random "I want to do a favor to the universe" charity organization.