Over 20 million miles spent with airlines (including about one million lost to Ansett). I dont think that the airlines realise how much revenue I actually make them from points sales (being a non-elite flyer with over 100 flight segments per year and 250,000 flying miles).

If the airlines sell miles for 1c each I would have net them over $200,000 in the past 5 years (not bad for a non-elite flyer).