Robots reduce labour costs in 1st world countries not 3rd world countries who have cheap labour. However I agree with the point you are trying to make.
"Dear 3rd world people, here is your crude roads and whacky houses built by our experimental mars robots, enjoy for free!"
That's not how the 3rd world works but the the idea is that those robots could do a) be perfected on earth and b) do something useful while they are at it.
