Because of the new legitimacy Las Vegas acquired from Hughes' investments, established companies such as Hilton Hotels bought into the gaming business, and their influence helped draw a line in the desert sand between legitimate operations and mob casinos, where illegal skimming of profits was rampant.
The landscape of the casino business was changed when Hilton Hotels bought in, giving the industry more respectability.
Established companies chose not to buy into the gaming business for fear of being tainted.