Not in a single player game. But in a multi-player game, I can see the added level of intrigue possible by being rewarded for a certain aspect of game play and trying to figure out/counter other players rewards. Another layer of diplomacy and potential conflict. I think it might be interesting if this could be linked somehow to victory conditions, that way you would not be forced to play a certain way, many roads might lead to achieving your objective. Come to think of it, if the AI opponents are forced to play a certain way, then it could be argued that being forced to play a certain way might be seen as a balancing issue. it could at least be modded as an option for someone looking for that sort of challenge.