Yup, that's the problem with it. Though I suppose if we predefined options it could be somewhat resolved.
Phase Length: 1, 12,24,36,48,72 hours
Pot: 5, 10, 50, 100, 250, 500, 1000, 2,500.
Or something to that effect. Even then, I don't know that we have enough active players to really randomize it. Most likely someone trying for an unfair advantage would still be able exploit the system as only one game of each type would be in the hopper at any given time.