I know they charge $150 for a one-off pass but how often are they selling those (versus saying the lounges are full / they can't sell day passes)? I've only ever used it while flying business / have never bought access, but one of the nicest bits is (at least at the ORD one where I'm based) it fills up but it's never felt oppressively crowded like, for example, the MIA centurion lounge.