My normal PHX/PHL flight yesterday was overbooked by 4 and everyone showed up.
$800 to take the redeye. I am feeling it now.
Talking to a gate agent, there were several worse, PHX-ORD was 9 people oversold ($1K each) and JFK went for $1500. One couple pulled double payment as they gave up a seat on Saturday, and hten again on Sunday. Good work if you can get it.