Used games sales are irrelevant to most discussions as money is not made on the secondary market, only on the primary (for the company that is). Also, GDP only counts first sales.
Used sales will always be higher then normal sales, but they should be as you are counting a game twice, which is also why they are irrelevant. More copyies are not being owned. The number of units sold is exactly the same, as a used game is not a unit sold (as it already was sold). Again, not relevant to discussion.







