EA, Eidos Have No Plans for Xbox Live
News for nerds writes "Eidos, maker of Tomb Raider, said it doesn't plan to make games for Xbox Live because Microsoft controls the system and manages subscriptions itself, leaving no incentive for a publisher to collaborate. Sony's approach is to sell just the equipment needed to connect to other's services, such as those run by game makers. Electronics Arts, which makes titles such as 2002 FIFA World Cup and NHL 2003 for the Xbox console, is also reluctant to join Microsoft's system, while supporting GameCube."
Actually if you read up on XBox-Live there may be a fee of $10/month once your first year is over. Also MS has never ruled out extra fees for future games. So basically there is no "designed in" cost savings over the PS2 online model.
http://xbox.ign.com/articles/361/361526p1.html
Extra fees are already being charged (will be charged upon release) of Phantasy Star Online for the XBox.
http://www.rpgfan.com/news/2002/1655.html
Cheers,
_GP_