The most important rule for selling any product is "make it as easy as possible for your customer to buy your product". Putting in roadblocks like "you must own DLC A in order to use DLC B" might get a small number of people to buy DLC A (begrudgingly), but a significantly larger number of other players who would have bought DLC B on its own would choose not to buy it at all. Putting in advertisements for other DLCs is fine as long as it isn't too much , because that typically won't drive (many) players away. It isn't worth it to shoot our own sales in the foot like that.

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