A replacement for the dented door for my 9-year-old fridge costs more than I paid for the whole thing originally. Some repairs are not that economical compared to a shiny new model with a fresh warranty. It's not my instinct (and I have the skinned knuckles from a fraught dishwasher heater pump swap to show for it), but I can see that the inflated spares prices, shipping, labour and call out fees if you can't DIY, hassle of locating the parts if second-hand (good luck figuring out the model numbers, there are thousands and thousands of subtle differences), transporting the thing if it can't be fixed in place, etc etc, do add up to Beyond Economical Repair for some people.