It's wild to me that two guys who have only ever made one truly successful property in their lives. (Okay...two if you count Book of Mormon), can keep milking that one property for 1.5 billion dollars.
I mean, I guess you could say that The Simpsons and Family Guy are similar, but with things like Futurama, American Dad, The Orville, etc... even THEY have their hands in different properties. Other than Southpark, what have Parker and Stone ever been working on television wise?