Why is the conjoined finger of road car so expensive?

High-tech, coupled with the different shift logic of major well-known brands, and they all applied for patents, others can't imitate them, and the imitation cost is extremely high. The world only knows Shimano, Su Lian and Compaq. Big three. Of course, Taiwan Province Province also has a low-end brand called Microturn. There are only a few logics for shifting, but these manufacturers have developed them and applied for patents. As a result, many people cannot enter the market and form a certain monopoly scale.