That's still kind of last-minute (I believe it was announced Tuesday). You'd think they'd have done more walk-up for a decisive Friday game (albeit only for Durham) but without season ticketholders (some of whom don't buy playof ticket packages to begin with) or group sales that's what happens in the minors.
Which is surely another reason why nobody sweats call-ups during the playoffs, you're not cheating "the fans" if the fans have stopped coming to the games. Pigs averaged more than 8,000 during the regular season and had less than 4,000 at Game 5. Scranton only had 1500 and 900 fans at their games against the Pigs.