I think it's for other Konami games since the KonamiID/GameID system is for Konami's games. I'd guess that they probably thought that their current system would be better than the one already in use for the PSN system that already works on the PS3 lol.
Perhaps they didn't realize that much has changed with Sony's online strategy from the MGS3:Subsistance online.
Meh, I just hope they can at least fix these problems. I don't think I'm going to be picking up the expansion either unless I use a giftcard. I don't want to offer more personal information into their servers because they don't want to use the PSN. I mean come on, all you'd have to do is throw some money onto your wallet, go into the PS store and buy (and then install) the expansion. Boom, you're done. Oh, and not to mention that the character slots you have to pay for feel like a slap in the face.
If anything, I hope that Sony becoming more engaged with the PSN could help to remedy problems like this. The whole single ID thing is looking rather nice.
