The Sam Vimes “Boots” theory of socioeconomic unfairness, often called simply the boots theory, is an economic theory that people in poverty have to buy cheap and subpar products that need to be replaced repeatedly, proving more expensive in the long run than more expensive items.
High quality shoes are made with construction methods that allow them to be resoled. With proper maintenance they absolutely can be BIFL. But not all expensive footwear is high quality.
Also resoling a pair of shoes will probably run you about a hundred bucks and a lot of people probably pay less than that for a new pair of shoes.