Hmm, well, thinking about it, I can see where they're coming from.
If you look at what I've done since joining DC in March, well, I've taken, I guess, 80 flights, most of them bmi. My average spend is about £200 (including the long-hauls). So, what, that's £16k. Take off taxes, and you're looking at less than half that, given most of the flights are LHR-AMS. Add on 20k freebie miles from the credit card, and maybe, what, £10k credit card spend.
From that little lot, I've got about 130k miles. So far, I've spent half of those miles (plus £450) on a F out, J back LHR-SIN-HKG return on SQ. And I could do that again.
How can that be profitable?
(Not that I'm complaining...)