[Dudi]

those bussiness laptop is cheap because they buy it in bulk and then they replaced it every year and selling the older one

Every year I think a little exaggeration but that is true that most large companies change their workers laptops every 3-4 years. And usually the employees have a chance to buy their own laptop for very chap price.
My uncle bought his Dell Latitude 4 years later, for just 1/10 of its original price .