if they did this, think of all the lost sales in ps3s, as the last post said, if it were true it would be a flop.
think about sony for a minute-and everything they make, tvs, dvd players, stereos,computers etc etc, almost every peice of hi tech equipment will have one made by sony.
plus the software aspect- sony blank discs, sony dvd/ cd burners etc- sony sell these and the chances are you will buy them to copy ps games for your mates.
if sony did this they would lose a massive amount of money-
if this idea was even bought up, i imagine it would have been on a drunken night out by some junior clerk in which he would have undoubtedly been fired and banned from all karoke bars across japan.
anyway- if im wrong il put my head in my piano, --- man.
sony are all too familiar with marketing which is why they did so well with the ps1 and ps2 and which is why they are still one of the leading brands in technology