Aren't retailers still paying for licenses? Or there's some easier way to get keys as a business? I noticed even shops that sell refurbished computers will sho

Aren't retailers still paying for licenses? Or there's some easier way to get keys as a business? I noticed even shops that sell refurbished computers will shove Windows 10 into them, I always thought it was around 10-20 bucks for a license, so that later they can charge us 90-100 for a computer with windows...