I'm currently running a short World of Darkness mortals campaign using only the core systems rulebook. I soon house-ruled that we weren't going to have Virtues and Vices for our campaign because they seemed very easily exploited. I'm afraid that the players might try every chance they get to randomly do something spontaneously saintly, not because it was the right thing to do or because the character would do that, but because they get to regain ALL their willpower points. And my players tend to spend willpower and get a +3 bonus all the time, even now that they can't really regain it. Imagine how it would be if they knew that they just have to do something nice to get bonuses all over again.
Should I keep avoiding the virtues and vices, giving them no proper way of regaining any willpower or am I just overly paranoid and it won't be as bad as I think?