Are PSP games worth money?

Are PSP games still valuable in today's market? With the rise of mobile gaming and the continued evolution of consoles like the PlayStation 5, is there still a demand for older PSP titles? Could collectors or gamers looking for a nostalgia trip benefit from investing in PSP games, or have they been largely forgotten in the grand scheme of the gaming industry? Is there a specific type of PSP game that holds more value than others, and if so, what factors contribute to this increased worth?