You should purchase a custom fly rod for the same reasons that you would buy any handcrafted work of art. You know that your rod was carefully made by a skilled craftsperson, dedicated to their art, and not assembled in a factory where the goal is maximum production of a product defined by multi-color advertising.
With your individually built rod, you will find that your casting is more accurate and your line control is better. Fishing with more confidence, you will likely increase your catch rate.
Take a moment to browse the custom rod gallery.