Most games, including AAA games, don't make a billion dollars, just like most movies. But that's also beside the point.
I keep saying it, but total revenue isn't what matters here. If you sell 1000 copies of something at $10,000 a piece, you've pulled in $10 million. If you sell a million copies of something at $10, you've also pulled in $10 million. Which base do you think is more valuable to a theme park where volume matters? A theme park doesn't want only 1000 people; that's not how their business functions (unless, of course, they could charge those 1000 people $10,000 to enter -- which is kind of what Disney is doing with the Starcruiser, although it remains to be seen how well it will work long-term).