According to Forbes who cites David Gibson, an analyst at Macquarie Securities, Nintendo is getting approximately $6 of operating profit for each Wii sold.  With nearly 35 million Wii units sold, this amounts to nearly $200 million on hardware sales alone, without operating costs figured in.

Forbes also mentions that Nintendo sells 60% of software for Wii itself which is much more than the competition is doing currently.

Yes, I’ve seen $6 lattes around my area, I do live in Washington after all.  As for the estimate, I’d say at this point it’s slightly out of date due to the system being a few years old now.  That should bring costs down a bit.