The other side of the coin is the subscription fees that are coming down the pipeline from Activision, EA, and other companies.
EA's plan of charging a nominal fee to enable multiplayer on new games is yet another expense for used game buyers or renters. While this will not matter to new game buyers in the scenario it does beg the question of what will happen with the other publishers.
Bobby Kotic has repeatedly said that he would love the CoD universe to have a subscription model for online multiplayer and whatever form that takes you are now forking over more money and it adds up here and there.
PSN is free but it comes at a cost. The bandwith is no where near as high as Microsoft's when it comes to downloads as well as other features such as no cross game chat (as of this post) so for those who only have one of the 2 consoles it just makes you think about what you want to do budget wise because I foresee that no matter what console you own, the day is coming when publishers/developers are going to charge you to play their multiplayer regardless if you are on XBL or PSN.