It's sort of a joke.
It's clearly not scientific, and is subject to all sorts of variables to what part of the country my front steps are in on Halloween, what socio-economic neighborhood my front steps are in on Halloween, and now is highly skewed because for the past 20+ years (in two different states) I've been known as the suspiciously stylish confirmed bachelor on the block who gives out full size Almond Hershey bars and See's Candy gift baskets as costume prizes. The gift basket prizes alone would skew the results to more creative or thoughtful costumes from the children.
Again, it's a joke thing. It's kind of interesting though to ponder what the kids are wearing for Halloween, but it's not scientific.
Did I mention it was a little joke? A thing that makes me chuckle?