Manufacturers, what are we spending way too much money on that cost pennies to make?

I did CAD work for a screen printing company. A full wrap on a car would be ~$20 in materials. Maybe $40 in labor and sell for a minimum of $1,000.

Soda

Popcorn at the movie theaters cost pennies to make but they charge $10+ a bag.

But most of a theaters income comes from the concessions stand since most of the ticket sales goes to the movie studio

Jeans

Children