Until last year I used FR regularly on a relatively thin domestic route; i.e. one that was always included in the promotion on FR's homepage. While it lasted, I hoovered up as many £0.01 and £1 fares as I thought I might night and used maybe 10 - 15% of them. However from 2009/10 onwards, then £0.01, £1, £3 etc sales started to dry up. While there are still some single digit sales from time to time, it seems revenue management are pushing even the cheapest promotional fares up.
Not surprising really with people like you spoiling it for people who actually intended to travel. I hope you feel proud.