I was recently thinking about the penalty for improperly determining a winner (MIPG 4.3). In my experience, they are commonly issued after a player finds out that a draw keeps both of them out of the money. One of the players (usually someone at his or her first tournament) grabs a die and says, “How would you feel about rolling for it?” BOOM they get hit with a DQ and feel like garbage. Reading the IPG we only have the following: “Using an outside-the-game method to determine a winner compromises the integrity of the tournament.”

I agree that this is bad for the tournament, but a naive offer for a die roll receives a harsher penalty than a player intentionally using a racial slur on his or her opponent (USC Major - MIPG 4.2). I'd just like to learn a little more about why the penalty is the way it is and the underlying philosophy here.

Actions that compromise the public image of Magic: the Gathering as a game of skill may not, MUST NOT, be tolerated.

When that player in your scenario makes that offer, there's a failure - either he failed to listen, or you failed to make the general announcement(s) about not rolling dice. I understand it's (usually) a mistake of ignorance, but it's one of the rules we require players to know. Since players aren't doing a great job of acquiring that knowledge, it becomes our task to educate, repeatedly.