Well fantastic fares unlikely since they appeal to the last minute business traveller.
A friend of the family was a quite regular commuter to JFK
(working with MoD) and he often didn't know whether he was travelling until he went into work. He'd have to bring his passport with him everywhere and quite often would turn up at the airport and buy a walk up Concorde fare, something like £8200 and would then return on BA004 in the late evening.
"My first job was selling doors, door to door, that's a tough job innit" - Bill Bailey