I don't feel I get bumped enough.
If Delta's availability reads F0 A0 Y0 etc. then they ought to be handing out DBCs to people since they won't accept $1500-$3000 for a full fare ticket. Annoyingly, this often turns out not to be the case and there are actually empty seats on these F0 Y0 flights.
See B747's posts about Inventory Management elsewhere for more examples.