Considering games like halo or titan fall charge $10 for 3 multiplayer maps, I think $20 is a reasonable price for 3 PvP maps, a strike(or 2 for PS users) story missions and a new raid but that's just my opinion.
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My point is that all but the crucible maps are basic addition that we shouldn't be made to pay for. These should already be included with the initial purchase of $60.