Datapoint
MUC to EWR
booked cheap Economy Light. ($400 round trip)
originally placed bid upgrade at minimum $575
Right before 60 hours out I checked seat map and only 4 business class seats available. New minimum bid was $595. Bid $645 and at exactly 60 hours out received email my bid was successful. Flight is sold out and I’m lucky to upgrade the in laws since my FIL is 83 .