Straws require ridiculously small amounts of raw materials though, if you choose a material that increases the steel price by $1000/ton, then that adds a single extra cent to the costs of a 10g metal straw which then retails for a dollar a piece.
I recall finance going ballistic on my division at one point because our profit margin dropped by a tenth of a percentage point (and yet was still well above fifty)
Think of the savings of slashing that finance department staff :)