When a product is built, the manufacturer typically has a life-cycle in mind in regards to how long a consumer will ideally use the device. For example smartphones are something that users typically swap out every two years and automobile manufacturers will look at car buyers trading in their car every five or so years.
The problem with this though is that humans don’t act the way these types of purchasing patterns presuppose. One would only need to look at a used car dealership or peruse eBay to find an aftermarket for cars or phones. Ok, eBay is enough for both.
