One of my friends was chosen for the WoW beta. He says that there's a system already in effect that penalizes you for playing a lot.
Your character has something like a stamina level (I forget the exact name) and the longer you play, the less experience you get. There's several categories that your character progresses through, from "well-rested" to "tired" or something. On "tired" you basically get no experience for running around and killing stuff, hence playing 72 hours straight won't get you anywhere.
You also have to wait something like 8 hours while being LOGGED OUT in order for your character to start recuperating.
That said, I still won't play this unless it's free like all of the other Battle.net stuff. Blizzard should just charge more initially for the game (like they're going to do anyways) and put ads for Pepsi or something in it. Have a monster that looks like a can of Mountain Dew.
