That's not really the only reason most people play MMOs. A lot of people play it just to play the game with other people. In one like WAR where there can be constant PVP, playing for free would be no different than playing an FPS or something. Login, end up in a random server, kill some guys, call it a day.
They'd have to tweak it, obviously. But we all know this would never happen, so it's more of a "what if..." scenario than anything =P
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