The page doesn't disclose the price of the license for gambling. It says to contact them down at the bottom of the page. "Other Unity licenses available."
Ah, thanks. I didn't see that. It's crazy that they can charge that much though just because it's used in gambling. I mean, the software is the same, right?
Cue the BSD vs MIT license flame wars over whether the BSD license is free enough or whether one needs the sublicense right grant in the MIT license to achieve full freedom ;-)
EDIT: Sorry if this sounded sarcastic. I was genuinely curious. Always happy to see a new engine out in the open!