I’ve thrown one fare away under the previous offer due to booking so far out, and spent a bit on change fees too. It’s the change fees that are the killer. The only saving grace is when you change the flight the offer maintains with it (I don’t think it’s meant to but it’s more likely the poor IT systems at play...) But VA have a $90 change fee, vs Jetstar who have $55 change fee and a flex no fee change for $35/$45.