I've booked 2 x PER-MEL-SYD-AKL-SYD-MEL-BNE-PER using Awards (PC Plus) or discount Y ($) to get to/from Melbourne. Looks like the total nett will be 1,420 SC's. Total Points used: 155.5k Total Dollars: $4.4k
Edit: Forgot the double SC's on the J Reward Flights so 1,420 it is.
As a follow up here it seems they've just voided both of the offers sent yesterday (email just in) and handed out a "10 x points on your next fill up" as an apology.
Had the accelerator email and, yes, the activation didnt work as it told me i wasn't eligible. I did, however, successfully activate a 3 x $50 spend (fuel or shop) for 3,000 points.