The biggest reason for wiping after beta in ANY game is because the final version could be balanced different. Without a wipe you could end up with unbalanced gear, items that didnt make it into the final build etc.
Things could go bananas and people need to realize this.
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This^^ guy is a god
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No, you silly little boy. Everyone knows that Morgan Freeman is a god. :P
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No, no, just a programmer ^^ <3