Depending on territory, they release games and add-on’s at different points in time.
I really don’t see HOW this maximizes profits for Sony and third-party developers but this release pattern has been established for years for both home video releases and videogames. Companies and the governments that they have to deal with are control freaks!
I know, I know… I don’t like it either! Nobody likes it when a game gets released earlier elsewhere and you’re looking at anywhere for a 3-6 month wait for the localized version to appear in home stores. One of the few good things about this generation of systems is that there are very few games that have region locks on them (unless you’re a Nintendo Wii owner and to a lesser extent a 360 user). Sony basically isn’t mandating territorial locks on Bu ray games because I think they want to establish a decent base for the Blu ray media and fact is that decent speed Blu ray writers and the BD media itself are so much more expensive than DVD burners that home-pirating isn’t viable.
I, for one, like the fact that I DON’T have to futz with modding a system to play Japanese games and movies like you had to with the PS2. That’s for the birds and frankly didn’t work well because of the common video standard (NTSC) that the US and Japan shared for standard definition. It was so easy to break the Region locks! It was more the Japanese wanting to keep out cheaper US releases of the same films that led them to enforce different Region coding on DVDs between the US and Japan. Nowadays, they rely more on 3-6 month delays for BD releases to curb reverse importation (into Japan). Game prices have never really been that much different between the US and Japan except for the cartridge era.
Sure, piracy still happens, but who except the cheapest kid (and one that feels they should get everything without paying for it) wants to sit through days and weeks of waiting for 25+GB games to download? Not practical for the vast majority.