How much did you spend on Halloween costumes, candy and whatnot this year? After the numbers are tallied, spending for the holiday is expected to reach a whopping $9.1 billion, up from last year’s record of $8.4 billion. That averages out to be $86.13 for each person. The most popular costume among adults was a witch, followed by Batman characters. 68% of Americans say that chocolate is their favorite Halloween treat. Last night I scared all the trick-or-treaters away with my looks.