High roller

They were all "high rollers" against faro, had plenty of money, and, if the cards came favorably, would "chaw up" a bank in double-quick time.

Source: wiktionary

Before long, Zarin developed a reputation as an extravagant "high roller" who routinely bet the house maximum while playing craps, his game of choice. Considered a "valued gaming patron" by Resorts, Zarin had his credit limit increased at regular intervals without any further credit checks, and was provided a number of complimentary services and privileges.

Source: wiktionary

He was a bigger net yield than any two or three girls because a satisfied woman was far more generous than a depleted john. And frequently, Rocco owed a high-roller a favor and the girl came back with nothing.

Source: wiktionary

Chief among the dire presentiments was the suggestion that the ascension of Labour to power would result in Radiohead ceasing touring and instead taking up a residency at a Las Vegas resort. The image of Thom Yorke serenading Sin City's high rollers with a rousing chorus of Pulk/Pull Revolving Doors was mind-boggling, but you could see why some press went on the offensive.

Source: wiktionary