If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Things become much easier if you drop the "physical" constraint.
A basic example would be the ability to gain power-ups by demonstrating rationality in some Quake/Unreal FPS environment.
It would become easier, I agree. It would also lose a lot of what makes real, physical things special. Why do people still play actual board games made of cardboard, or bother to meet face to face? A lot of the rationality involved would probably be figuring out through facial expression and vocal intonation whether or not you can trust someone, and this is nearly impossible in a nonphysical context.