PlayStation 3 jumps up to 6 million worldwide sales?

Read the subject line again then remember worldwide sales are reportedly at 4.5 million. At Australia's "Experience More" Sony event, they estimated 6 millions PS3 sales globally. If we pretend they were estimating PlayStation Network users, it's a lot more believable. A lot of people are taking advantage of the multiple account system Sony has continually, kindly ignored! Alas, we can't do that.

The Experience More event was a huge promotion for the PS3, Blu-ray, and whatever else Sony felt like talking about (like those hot OLED screens). Blu-ray, they said, contributed to about 80% of all high-def content sales, excluding PS3 games. Australia itself, it was estimated, had about 64,000 PS3 units sold in it to date, which is pretty good considering the price (the chart listed above was claimed to be a little dated). So, is it 4.5 or 6 million units sold worldwide (CNN estimated about 5 million as a correction)? Different market estimates, we suppose, but that's a pretty big gap. Thoughts?