system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how thousands of cows go through the slaughter house a year and yet leather products are still so expensive.

With supply and demand, shouldn't the theoretical high supply of raw leather from cows killed for meat processing drive the price of leather goods down?
gpt
you're not just paying for the cow hide, you're paying for the cost of turning that cow hide into tanned leather, and then turning that leather into the final product. 

let's just say it takes a lot of work to turn cow skin into wallets and purses.

for an example, cotton is cheap, but when you buy a cotton shirt, you're paying for the effort that it took to turn it into a shirt and not just the cotton that the shirt's made of.