It's a reactionary move precipitated by the hacking done by that geohat guy. A lot of gaming companies think that by making a console pirate proof (which the PS3 has been so far) saves them money in the long run.
Look at the whole Ubisoft Assassin's Creed 2 mess.
In Sony's case I think they partly blame the PSP's problems on piracy and don't want it to happen to the PS3.