Qantas says that less than 5% of pax flying from Australia to Europe get out in Singapore. Singapore is apparently a non-existent market that everyone flies through and doesn't stop at.
Maybe my maths is bad, but In 2012, there were 344,000 Singaporeans who visited Australia (Number 6 source country) and a million Australians visited Singapore (Number 5 source country). That's 1.34 million visitors one way per year, or 3,682 per day or 16 A330s at 75% capacity.
For O&D traffic that is not insignificant, that's massive. That's 4 A330s A DAY to Perth and Sydney EACH and 3 A330s a day to Brisbane and Melbourne EACH, plus 1 to Adelaide and 1 to Darwin+Cairns. I am guessing SQ almost owns the O&D market between Australia and Singapore.
The new QF SIN schedules are a huge turnoff for SIN-based pax. If you're on a family holiday why would you want to wake the kids up at 5.30am to get to the airport by 7.30am for that 0930 departure? What's wrong with the late afternoon departures QF used to have?