I think that the outrage (pardon the pun) that this is caused is a little over the top. The sewers are an incentive for buying new, a lack of them isn't the end of the world. If you want the sewers, go and spend a bit more on a new copy of the game. While I do have a hatred for DRM in many forms, there are much worse things they could do that would seriously impede gameplay. In short I think this is the right way to handle it: If people buy the game used give them the game, if they buy it new give them some bonus content.
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