Actually, yes they can charge you for excessive use. Most companies don't do that anymore, but as nitestick said there used to be caps on the total amount of data transfer rates. I doubt this will be any problem what-so-ever anymore, because modern companies would go out of business very soon if they did this. HOWEVER, there has been additional talks in congress about implementing something similar to this in a taxation of data usage, that would screw not only Sony, but MS and any gamer out there. Now, as far as the other fellas question about browsing, no. Game use would require much more data transfer. You are in a constant changing environement when it comes to online gaming, and websites tend to mostly be static. Now, one thing you would have to worry about is not Sony charging but game developers charging a monthly fee, for example the route that WoW goes, but that's also very doubtful.