Karma is the most precious substance in the game.Therefore, you could make it both ways, just uphill for both. So around 100K

for a single point of Karma. And for those in need of a quick buck, you can trade in 1 point of Karma for 10K

The impotant thing to do though, no matter what the values are, is to make the player consider the consequences of his/her actions, and to make sure that it is challenging enough to not be a common occurence, because if you do make it easy, eventually the game will become so easy that it will lose appeal, and the players will lose interest.