If that was in Perth I would pay $650 for it tomorrow. I have had two McT GSI Fireballs and one is nearly 7yo and still in good nick (a little yellow and some deck compression around the back foot area - but it has been used a lot by a 115kg bloke

) sold recently it to a mate for $500 with bag and fins and he was stoked. It's now his daily driver.
For the record, I have had 5x GSI boards in all and all of them have done their job as well as any custom board I have ever had. In fact, my last two customs delam around the tail pad area after 3-4 years - I gave one to the neighbours kids and sold the other to a backpacker for $150.