@jellyfishprince: That graph is the source of many common misconceptions. The PS2 had a staggered launch, being launched in Japan much earlier than America/Europe.
If you check the same graph for each region, the picture looks very different:
http://vgchartz.com/hwlaunch.php?cons1=PS3®1=Japan&cons2=PS2®2=Japan&cons3=X360®3=Japan&weeks=156
http://vgchartz.com/hwlaunch.php?cons1=PS3®1=America&cons2=PS2®2=America&cons3=X360®3=America&weeks=156
http://vgchartz.com/hwlaunch.php?cons1=PS3®1=Europe&cons2=PS2®2=Europe&cons3=X360®3=Europe&weeks=156
The PS3 is not selling on par with the PS2 in any significant way.
PS: I would have used Total Other instead of Europe but that graph doesn't work well.
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