Seems there's an extra reward if you completed the 1st Uncharted
http://www.gamingevolution.info/view.php?id=8641
Quote:
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If you have a saved game of a completed playthrough of Uncharted 1 then you get $100,000 to spend in the store for Uncharted 2. We didn’t go with the platinum because we wanted to reward more players.
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