Here's some info for you. Maybe not all you wanted, but...
http://vgchartz.com/japtotals.php?name=final+fantasy&maker=&console=PS2
Japanese sales
Final Fantasy X | PS2 | Square | 2,734,784 |
Final Fantasy XII | PS2 | Square | 2,328,910 |
Final Fantasy X-2 | PS2 | Square | 2,111,206 |
Final Fantasy XI | PS2 | Square | 153,860 |
http://vgchartz.com/atotals.php?console=X360
Xbox360 USA sales = 156,250 (#60 on the chart)
http://vgchartz.com/japtotals.php?name=final+fantasy&maker=&console=X360
Xbox360 Japan sales = 16,172
I think these are really interesting numbers because they show the interest in MMORPGs in Japan very well. Compare the other FF game sales with FFXI and you'll see what I think is a big reason why Nintendo has the belief that online doesn't matter so much.
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