Why do you guys seem to completely ignore the fact that Babylon will probably be out a month after the game for ~$5ish? :O
Sure, you shouldn't have to pay, but atleast retail buyers get the option. I don't have the option of buying the miniatures for $5ish after the game is out.
10% of the full game price for about 1% of the content? Yeah, that's going to sell. $1 would be a good pricepoint to buy a stand alone civilization.