There is a post on how these dice are done and lots of info on those. As for why aren't they in runebound the answer is obviously cost. It does not cost the same to make 50.000 dice than 3 million (as they are probably doing now).
Profit margins are profit margins. Should FFG make less profit now because they are successful?
People were willing to buy their games with those components at the price they were sold. Simple as that. If people weren't willing to buy them FFG would have changed either the quality of the game or the price.