So the flight I'm currently looking at, which is probably QFi's most popular route, at Christmas, so most popular (read expensive) time:
Syd-Lhr in J
Flex pricing $17,000
CR = 289,200 points = 5.87c per point value
Points plus pay = 3,000,000 = 0.567c per point value.
Now we know QF prices points at roughly 2.7c per point to buy, but for example woolies is 1c per point.
I can't see QF going for a easily available points option above 2c/point, so would guess flights either severely limited or 3x CR or higher...