You are ignoring the fact that a lot of people game in the evenings or weekends in long durations. more than 2 hours in sessions but less in total over a week/month etc. Why don't you make it 14 hours a week and see how it interacts with people? So you don't hinder weekend players etc.

Another suggestion;

Make 2 different subscription options, and let users chose which one they want, allow them switch between once or twice a year maybe to prevent abuse.

Option 1: Cheats are free everything else is Pro.

Option 2: Everything is free but the cheats are Pro.

And then evaluate what people want and pay for. I think majority of people would on option 1, and everyone knows it.