Cakes aren’t mass produced in a factory. They are produced in relatively small numbers in a labor intensive environment.
Let’s look at the math for a small bakery.
Let’s assume maybe $1000 per month for the cost of the building, and maybe $500 a month for equipment, electricity, advertising, etc. Let’s also assume there are 5 grocery stores within driving distance of this bakery and each store sells 10 cakes per day. The bakery needs a delivery van, so tack on an additional $500 per month for that. So we’re up to $2000 per month and let’s assume each month has 30 days, so that’s $67 per day just to have the building and a van.
The bakery makes 50 cakes per day. Let’s assume they have 2 bakers, 1 driver, and 1 manager. The bakers make $10 per hour, the driver $10 per hour, and the manager $20 per hour. For an 8 hour day, that’s $400 per day total in salaries. But then there’s health insurance and overhead and all of that, so it ends up being more like $800 per day.
And there’s the raw materials. Let’s assume $2 per cake, so a total of $100.
So costs of $967 per day divided by 50 cakes is roughly $19 per cake. The owner needs to make a profit, otherwise he’s better off putting his money into a bank rather than a bakery, so they need to sell the cake to the grocery stores for maybe $22 per cake. The grocery store needs to make money, and they have building costs and electricity and all kinds of overhead as well, so if they don’t sell it for at least $27 per cake they lose money. At $29 per cake they make a decent profit, but they aren’t getting rich on the deal.
I just pulled all of these numbers out of my backside and I doubt that they are anything more than roughly in the same ballpark for a real bakery, but the point is to illustrate how something that is relatively low volume and labor intensive can cost a big chunk of money.
High volume assembly lines are what gets the cost per unit of your cake mix boxes down to $3 per box.