I'm normally against DLC, but this game is SO packed with content that anything above that might be worth paying extra for (depending on what songs / modes it actually brings with it). Imagine if they gave it the batman66 treatment (Oh hey Joe, I see you decided to play some pinball today)
Or maybe it can be like, you add a credit, and it shows al walking up to his own machine, then turns around "Oh... I was just gonna play my game but... I suppose you want to play huh?"
Hitting start: "OH FINE! GO AHEAD! I'M NEVER GOING TO GET TO PLAY MY OWN GAME!"
Hitting either flipper: "really? You'll let me play? Oh man, you're the nicest guy!", and you proceed to watch Al play a full game