Originally Posted by
phlwookie
The amounts seem to vary by how badly they need the seats.
One more data point, from talking with the guy next to me in line to board PHL-FRA in early June. He'd accepted a bump when they were 10 people over maximum, and received $700+ (I want to say $780? - I assume it was credit), a hotel room, and meal vouchers for the airport. He had listened as one agent instructed the other on how to process his bump, and had thought from the conversation that he would be in business class. He wasn't, although they did give him a bulkhead seat.
As others have suggested, I think it depends on how desperate they are. Across from where we were waiting to board, there was a flight to Manchester, UK which had a series of announcements requesting voluntary bumps.