Here's what Atlus has to say about this:
" @mutha3: and I have no idea where ur getting ur numbers from, I got these from vgchartz. I know theyre not the most reliable but they cant be off by more than 100k in sales. Heck according to them FES sold almost 50k copies in the 1st wweek alone.
I don't feel like digging up the Atlus's 2007-2008 fiscal reports, but, P3fes sold 11500 and P3 sold 64000. Check the comments, you'll find a witness.
And, yes, Vgchartz has been proven to be wildly inaccurate before.
EDIT: see? According to VG charts, P4 sold 310,000 copies in NA That is 200 K north of the actual numbers. VGchartz is trash and should never be trusted, this has been been proven many,many times.