Modifying progressive award parameters

A method of operating a gaming system, the method comprising:

• storing, by a memory device, first data associated with a first grouping of gaming devices having average expected payback percentages in a first range of average expected payback percentages, and second data associated with a second, different grouping of gaming devices having average expected payback percentages in a second, different range of average expected payback percentages,
• maintaining, by a processor, a progressive award,
• responsive to a first placement of a wager amount on a first play of a first game at a first gaming device of the first grouping of gaming devices having the average expected payback percentages in the first range of average expected payback percentages:
• incrementing, by the processor, the progressive award by a first amount which is based on the wager amount and a first progressive award contribution rate based on the average expected payback percentages in the first range of average expected payback percentages of the first grouping of gaming devices, and
• causing a display, by a first display device, of the progressive award incremented by the first amount, and
• responsive to a second placement of the wager amount on a second play of a second game at a second gaming device of the second, different grouping of gaming devices having the average expected payback percentages in the second, different range of average expected payback percentages:
• incrementing, by the processor, the progressive award by a second, different amount which is based on the wager amount and a second, different progressive award contribution rate based on the average expected payback percentages in the second, different range of average expected payback percentages of the second, different grouping of gaming devices, and
• causing a display, by a second display device, of the progressive award incremented by the second, different amount.