Cost have always been the overriding factor when it comes to building a physical infrastructure. Take for example this wooden pedestrian bridge in Netherlands. Relatively speaking, a simple steel bridge would be much cheaper and faster to build then using wood with this design. However, when investment becomes the overriding factor, a different perspective comes to light.
Investing in this design and using a particular material to build it increases visibility and interest not only locally but internationally. Level of visitors will increase hence increasing the tourism revenue. The return on investment multiply exponentially above and beyond the original design specification of just connecting one side of the river to another.
We should have this though in our everyday lives.