They are all in the playoffs, but what is at stake is winning the division and home field "advantage," which will be a real advantage in the future but not so much this year.
Division winners
Yankees
Tigers
Athletics
Wild card
Orioles
Rangers
UNLESS Orioles win tonight v Tampa and Yankees lose to Red Sox, which would tie them with NY. Not sure but I believe they would actually play a one game playoff to decide which one is division champ and which one is wild card. I might be wrong about that.
Bottom line: It's not so much your argument but your sentiment I agree with, that Selig is an idiot.