TWRoO on 02 July 2008
See this has been brought up many times now (it's the old DFC prediction) and it is very odd.
They predict that the Wii will sell more hardware units by a decentish margin (I think they believe PS3 will catch up in later life, but not by enough to quash much of the significant Wii lead) and yet they also believe that PS3 software will sell more than the Wii.
As the OP has proved with those figures from Wiki (they actually come from Sony/Nintendos fiscal reports) they both have very similar attach ratios (the Wii software does not include Wii Sports btw)
