I don't think it's been posted yet but vgchartz.com's Mass Effect sales number has been a topic in Bioware's offical forums, and apperantly this has motivated a response from Jarett Lee their Marketing Manger. Here is what he had to say:
" Through official channels the current sales quantity (which I can't share, so don't ask
) is considerably better. Not sure about vgchartz's methodology."
Check it out here:(it's half way down on page 5 of the subject)
http://masseffect.bioware.com/forums/viewtopic.html?topic=602247&forum=104&sp=60







