Another case, I've got a water purifier at home that uses a series of filters (sediment, reverse-osmosis, UV radiation, carbon etc.). Due to the quality of water supply, the sediment filter requires manual cleaning every month or two, else everything down the line stands a chance of getting damaged. These filters aren't cheap ($100 every 2 years in a 3rd world country). I find it annoying that the design of these filters is such that it is cumbersome to remove that simple sediment filter. Almost everyone I know ends up paying the service provider for annual maintenance. In reality, a simple design change can make the maintenance super easy.
It's the same story with modern cars, gadgets, washing machines, everything. The money to be made from repair is a whole industry. On the brighter side, the industry is begging to be disrupted.
P.S. I've tried repairing my laptop for broken hinges, displays, heat sink etc. by watching youtube videos & ordering cheap parts from ebay. It's an immensely satisfying feeling when the gadget starts working again. You not only save money & environment, you can justify your engineering degree too :-)