Coulter, once again, is being obnoxious and (probably deliberately) off the mark, but she has a point.
It seems, far too often, that missionary work has become some sort of fad, something certain Christians (especially women) do as a way to check something off on a checklist.
I truly believe fewer people are called into the mission fields than actually go into them. It is not that we don't need missionaries and support staff. Indeed we do sometimes. Yet although there is some importance to feeding the hungry and caring for the sick, I don't believe that God requires us to chase down the hungry and the sick all around the world, something that it seems a lot of today's missionaries are doing, as if those deeds will somehow please God. The scriptures are pretty clear that we are to help those we encounter. Increasing the number of people in need we encounter is not going to increase God's blessing if God did not ask us to do so.
It's true, America is a prosperous country and doesn't need the kind of mission work that goes on in the Third World. Yet spiritual bankruptcy is running rampant. It has unique needs that money cannot fix. Yet even the brick-and-mortar churches are abandoning the lost.
Consider the ministry of Jesus himself. Only once did he minister to a Gentile, and then only because she had approached him. He focused on his own community, the Jews, who were corrupt and astray.