Sorry - gotta disagree. The RPI NEVER makes sense. It's built on a "sounds good" but flawed foundation. Been proven many times over that it's predictive ability of rating two teams against each other is very low. With current schedules, no matter how many games are played, RPI won't get the order of the teams right. (Digging back into the recesses of my brain, pulling out some of my graduate engineering math stuff, I think I might be able to argue that IF every team played every other team exactly once, (a 348 game season!!), then RPI might be be accurate - though I'd have to think on this for a bit)
As far as I know, the purpose of any ratings system (by definition?) is to rank teams - as in the one ranked higher should beat the one ranked lower. RPI fails to do this even late in the season.