Just like with most of the high-end items, an expensive suitcase is considered to be an investment – particularly, in your future travel experiences.
It is a guarantee that even if your flight gets canceled, the hotel you booked turns out to be a disaster, and the weather forecast isn’t promising, you at least can rely on your four- or two-wheeled travel buddy.
This doesn’t mean, however, that more affordable suitcases are a bad investment (there are numerous cheap-ish travel bags that can compete with high-priced suitcases) – it’s simply a better assurance in your travel gear’s quality and durability.