How much does it cost Sony to keep PSN free?

[dsgrue3]

Garnett said:

Heres the thing,With XBL you pay $50 every year, with the SLIM you pay the extra $100 up front for online.

Umm, no? Unless you are comparing the arcade to the PS3, in which case your argument is pretty mute as you can't play any games...without purchasing external peripherals...