Merchandise selling fairly well does not really mean an attraction is justified.
While it is always what companies look for when approving an attraction, besides its initial draw they want lots of themed merchandise that people want to purchase.
But its a cult following, its going to sell well because there are people who are passionate. Not Star Wars, Harry Potter or Indiana Jones passionate, but a large enough group to know they can cheaply make merch and sell it. They have the rights to the property and they are gonna make money off it.
Let us all look at it this way since some people are not convinced this thing is just mediocre in the big picture to The Disney Company.
Prince Caspian. With international sales and home video it made its budget back and then some.
Yet, Disney has no interest in a film series that does that. If they spend near 200 million dollars to put a film out there on the market. They want at least double that back. Why Toy Story 3 is a HIT and Tron Legacy is not.