I don't understand a debate about what anything "should" cost anyway. The price is what the seller asks, and you either agree to the transaction or don't. I have no idea where a "should cost" price comes from at all.
This, applying a logic that isn't included to begin with isn't logic at all. Logic is based on facts and validity.
FACT: Skyrim was 60 dollars, and that had nothing to do with the length of the game. By that logic, the valid conclusion is that the DLC isn't going to be priced based on it's length, but the industry standard itself. You can apply logic to almost anything, and argue with the general consensus. Just because it's
YOUR logic, doesn't mean it's right for the situation. By that measure, a game like Dark Sector, which took me about 12 hours to complete, should have cost me about two dollars and some change. Assassin's Creed II took me around 20 hours, so that should be four dollars too? This just butthurtness at it's finest.