Also, I'm assuming these are VGC numbers we are using, so they are undertracked for the PS2. Sony themselves have PS2 shipments to just North America at 47.68 million at the end of March '07. If the US makes up about 85% (estimating, but probably about right) of all shipments for North America, that would put shipments at ~40.5 mil about 5 years ago.
Now here's where it gets a little tricky, because Sony stopped breaking it down by region in '07. The PS2 has shipped 38 million more units since March '07. Let's say that NA saw 1/3 of those shipments (this is conservative since it was more like 40% up until that point), which would put them at 60.22 million and the US at ~51.19 million shipped. There's no way there's ~6 million PS2's on store shelves. So, most likely the PS2 has sold ~50.5 million PS2s in the US. I seriously doubt any console is going to pass it anytime soon.
