Since i'm bored, i'm gonna break it down a little:
Let's pretend it has been certified 1 time platinum extra in each country where it's actually certified platinum. It would look a little like this:
The last known figures for the US are: 2,619,933, no need to imagine new sales for this one.
Canada: 40.000 copies sold (4x platinum) + 1x would make it 50.000
United Kingdom: 1.1 million. (3x platinum) let's make it 1.2, wow, that's a huge difference!
Australia: 280.000 (4x platinum) 5x platinum would make it 350.000. We're getting there
Germany: 300.000 (1x platinum) it would be 600.000...
France: 250.000 (1x platinum) 500.000.
Ireland: 30.000 (2x platinum) 45.000 if we pretend it's 3x platinum.
From these countries alone and pretending it has been certified one time more than the actual certifications tell us, the sales would only be at 5,364,933 copies. It has sold 150k in Philippines which is the only other big country as far as sales...
Stop dreaming, it's still impressive nonetheless.