Economy + Great Barrier Reef vs Business
Have just flown Emirates JNB-DXB-BKK-SYD return with my wife and 2 kids. Cattle class. The cost of upgrading just 1 of us to business was more than a 4 day cruise on the Great Barrier Reef in two suites. The reef won hands down.
Travelling as a family we can create much better memories by putting the available funds to use at the destination. Travelling business does not create memories!