Way i read them is get the lowest points currently on offer for all seat choices. If you pay for the flexi ticket thenyou get full economy rates - no incentive for those with status to pay for works plus and definitely not to make flexi as even some of the seat only flexi fares are incredibly expensive - CHC /SYD 13/10 seat only $112 flexi seat only $392, cannot see worth as extra $280 for extra 10 SP, buy wil get APD