I'm not sure if this has been posted but I thought you might find it interesting:
For Nevada, per the Gaming Control Board Gaming Revenue Report for the 12 months ending on the last day of June 2016, statewide penny slots held 10.04%. How good of a deal you get depends on where you are at.
The Carson Valley area held 7.23%
Downtown Vegas, 11.34%
The Strip, 11.55%
North Las Vegas, 9.49%
Laughlin, 11.06%
The Boulder Strip, 9.58%
Mesquite, 9.58%
South Shore Lake Tahoe, 11.20%
Elko County, 6.87%
Wendover, 6.42%
Reno, 7.33%
Sparks, 6.42%
North Shore Lake Tahoe, 7.71%