commuting SEA<-->WAS about twice a month for most of the last three years as a PM (95% self-funded, probably 75% purchased less than two weeks out), I have scored a few UGs on midweek redeyes to JFK/DTW/ATL (and sunrise returns), and two on SEA<-->LAX in the past three months
I have also been 18 of 70+ for two F seats on a Thurs evening for WAS-ATL-SEA, with a ticket purchased less than three days out ... situations like that are what have driven me to being in the WFBF camp