Ni no Kuni has sold 1.4 Million Units on DS and PS3

[Kresnik]

Wright said:

So I assume 500k is a success?

50k can be a success for someone like Compile Heart.

The 'Tales of' series was a massive success at ~600k domestic sales; but still seems to be doing alright at ~400k.  I'm assuming this would be in the same ballpark as those kind of figures.