They have to keep the price of the game to a reasonable level, but the cost of developing has increased substantially since the days of RTW. Hence the DLC trick. Dishonored still costs something like 50 euro on Steam, bar the two DLCs that come with it, for example. Imagine it costing around 80 euro (that's approximately 100-110 USD), that would be absurd.
DLCs are also a way to milk the customer base after the initial sale, because there will always be those who have more money to give. Why wait 3 years for an expansion when you can give them blood splashes or music packs or some ahistorical special unit like Ninja Assassins from Hades and charge between 5 and 15 euro? Sure, some users won't buy the DLC, but let's say that 40% do. This effectively makes it so that you got an extra 5-15 euro on top of the first shipment price from those customers. if the game ships for 60 euro that'd be a hefty 25% increase, and I'd dare say this is pure profit since you didn't really invest that much in the making of this grand "content" you provide.
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