Quoting Gimpin:
cool tool ... serious markup. Can't cost more than about $5 to make it ... more power to the inventor though
Figure about 20 for materials and thats if he's anodizing himself, replacement cost on endmills, machine time and design time added to that, not to count his monthly payment on his mill and costs for software, then shipping, labor charges, taxes and workmans comp etc . He might be making 5 dollars on each when you look at the big picture.