Yup, that's just pure greed. No argument from me on that.
That said, I have to think this was a lame attempt at testing the waters for previews to Star Wars Land. I imagine they are trying to figure out what the market can bear for preview tickets to new stuff. TDA went overboard on this on purpose, to see if there's a market for a $300 ticket to ride a rethemed 17 year old roller coaster, a repainted Ferris Wheel, and get chintzy samples from five new snack bars.
If this flops and only a few hundred idiots and some neckbeard vloggers buy tickets, that means the preview tickets for Star Wars Land may only be in the $300 to $500 range.
But if this actually works with at least a couple thousand idiots, then the preview tickets for Star Wars Land just shot up to the $899 to $999 range next year. TDA is just using this as a test, but they come off looking like total jerks for doing it.