PSC is my home airport so I fly PSC-MSP a lot. This route often does not release upgrade inventory until 3 days out or even the day of the flight. I went MSP-PSC last week and Y was oversold with no coach seats available for sale but there were 9 empty seats in F at the gate. After upgrades, the flight left with empty seats in back, a fail for Revenue Management. I would not worry about it.