The article mentions that the charity raised $12.5 million a year with $77 million in assets, in addition to the Korczak’s Heritage, Inc that runs the gift shop, food, and bussing. edit edited that in I see.

>A completed, privately-owned ticket-selling attraction in the hands of non-Indians would be less appealing than a project with donations to supposedly honour someone

They also use the creation as an attraction. When you see Mount Rushmore, you are left with a desire to see something like that being made. Crazy Horse offers you that chance by selling tickets to when explosions happen.