i think its just random-ized IMO
basically, its not going to ask about nintendo based products because of general interest. its geared towards questions that can virtually relate to everyone. however, i do find myself asking the same question that you just did. i mean honestly, do I really care about who brushes their teeth after breakfast or before? (and yes that was a real question! i picked before)
in any event, i do agree that more people should submit nintendo related questions but youre going to see alot of nonsense things instead.
thats just the way the cookie crumbles