This launch is a mess.

[Walkerged]

Nice fallacy. The cost of the expansion does not drop after the early access period ends, so no, nobody is actually paying extra for it.

Not a fallacy then. The cost was part of the bundle one paid for. If you wanted to argue the price went up after the initial preorder campaign or is being paid for by people who didn't preorder, you would be more correct.
However, any business with a good Accounting department will have a cost analysis done to figure out their cost segments before starting production, and will then price their product so the cost of something offered as free with the product is actually included in the purchase price you paid for the product.