His comment is related to cash monies, qs. You sell 20 million copies and you tend to worry a bit less about a couple of dollar kick back on the sale of used games.
Nintendo make 'ever green' products; they don't get the press that something like COD does because they don't sell in droves on opening weekend, but they sell through out the lifetime of the system that they are released on. That heavily implies that sales of used product has little impact on them. Shit like Mario stays in the charts for months and even years sometimes and that's without a price drop.
