For one PS3 is the reason Br kicked hddvds ass = billions in royalties for Sony. Future music/tv/movie download service through the PS3. The PS3 is pretty much intertwined with almost every Sony corp division in some way, it will become one of their biggest money makers eventually.
A person would have to be ignorant how business of large corporations work to think they wont make net profit on the PS3.
you'd also be ignorant if you think any estimation of such a number is reliable in any form, sharp or disguise.
the Wii is an epidemic.