Perhaps they signed up for a Jetstar mastercard and got 30,000 points instantly. Or maybe from years of supermarket shopping? Who cares how they got the points. If qantas were making a loss on award tickets, they wouldn't offer them, but the profits from a fare-paying pax will always be greater than a pax who has just paid fees/taxes. Some QFF members accrue hundreds of thousands of points and never use them, and some that use them as soon as they have enough for a J award. But Qantas would be far more interested in keeping loyalty in a passenger that has the funds to continually pay for a J or F ticket, as opposed to a pax that always flies Y and redeems points for J when they can.
I feel sorry for the OP because i've been in his shoes when a flight was oversold, it's a very disappointing feeling, but it's not like the OP got a bad deal out of this, he got the option to wait for the next J flight, and in the mean time, he got lounge access (and seemed to have gotten as much piss out of the QP as possible), he got offered champagne in economy, a $200 Duty Free voucher (which I think he said was redeemed for CASH!), and he got 50,000 points back.
Not exactly the worst of scenarios.
No I got the $200- as duty free goods that I selected.
And compensation cash of $982-
50000 points back.