Why are gearboxes so expensive?

Why is it that gearboxes, a crucial component in many mechanical systems, often come with a hefty price tag? Could it be due to the intricate design and precision engineering required to ensure smooth and efficient operation? Or is it the high-quality materials used to withstand the rigors of heavy-duty use? Perhaps it's a combination of both, or there are other factors at play. Whatever the reason, it's clear that gearboxes are a valuable investment for those seeking reliable and long-lasting performance. But what exactly makes them so costly, and are there any ways to save on the cost without compromising quality?