whughes3 raises an interesting point about discount fares. Now that even N class fares can be changed (with a fee), surely a lot of companies would be better off (financially at least) if they could book the cheaper fares where available.
Of course they're not always going to be available - I'm looking at going PER-SYD on Sunday, but there's nothing but full Y available. I've suggested they could send me via Adelaide - they save some money, and I get 100 status credits for the trip. (PER-ADL-SYD-PER) Everyone's a winner!

Except for having to travel on a Sunday.
Steve