Correct, the same casting gimmick will not work every time, and you're going to exhaust that audience fairly quickly. Jinkx is one of the few Drag Race stars who does have some name value outside of the DR fan community. But maybe once a year?
I wonder how much CHICAGO is benefiting from tourists who might have otherwise gone to PHANTOM but now they can't because it's sold out/closing? That's not enough to fill it nightly, but it could be boosting its numbers as a long-term show with name value and available day-of inventory.