Destiny doesn't near the size or content of a normal MMO like WoW. The two can't be compared like that.
CoD DLC is overpriced, but it and Destiny are both being milked by Activision, so that doesn't compare either.
Titan Fall's map packs are $10 each, and if you get Battlefield 4 Premium, each Expansion is only $10.
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Yeah, you can compare them, because on top of costs of expansions, it is $15(?) a month to play, which pans out to over $200 a year if a disc is released each year. This is a much better deal.