I agree with you, but I just think Rob's mentality is play every game that's on the schedule. A coach's typical answer to the question "do you know where you're ranked?" is usually "no." Their focus is simply on winning, especially at this point in the season. Again, I may be wrong but I don't think he'd ask to cancel a game because it's an RPI hit.
Either way, it's a fun rank to follow and when you're having a season like we are thus far, it's really fun.