[alkonaut]

The articles mentions a raise of 15 to 30%. A waiter who makes 40% tips would probably accept a no-tip job at a 30% raise (Assuming the 40% tips weren't very stable).

[surrealvortex]

At least some of the 30% would go to back-end staff. The article I linked to presents a case where the cooks etc had a raise because of this.