Leather jackets span an enormous price range, and the gap is not arbitrary. Most of it comes down to what's inside the word "leather."
Where the money goes
The grade of hide is the biggest lever. Full-grain uses the best part of the hide and rejects the rest, so more raw material is bought for less usable yield. Corrected and bonded leathers use cheaper layers and scraps, which is precisely why they cost less to make and less to sell.
Tanning and finishing add to it. Doing it responsibly — tanneries meeting real environmental and welfare standards — costs more than the alternatives.
The cost that doesn't show on the tag
A bonded or heavily coated jacket is cheap today and disposable tomorrow; once the surface peels, there is no fixing it. A full-grain jacket is bought once and worn for years, improving as it goes. Divide the price by the wears and the maths inverts — the cheap jacket is the expensive one.
Fewer, better. The point isn't to spend more. It's to buy once.
We'd rather sell you one full-grain sheep leather jacket you keep than three coated ones you replace.