I think this is an interesting and valid question to be discussed! I think the initial massive boost in sales are due to long time costumer upgrading their ordinary 3DS to N3DS, so I'm not sure how big an effect the commercials have had yet - I think that remains to be seen in the following weeks. If Nintendo keep on advertising to an older audience with N3DS and sales are consistently up, THEN you have a case. As of now, you're drawing a premature conclusion that "adult commercials = sale boost". Wait and see.
But I agree that Nintendo should target an adult audience more aggressively - but NOT on behalf of the kids commercials. Nintendo simply needs to advertise more, and do so more smartly. When targeting adults, talk more about the specs and mature titles, when targeting kids, show fun and engaging interactions between other kids.
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Furthermore, I think VGChartz should add a "Like"-button.
