Piers have to pay for themselves, and few make profits nowadays; even at their peak in the 1860s, they never brought in the promised dividend to investors.

• 维持一座栈桥必须得不停地投入资金，而直至今日也罕有栈桥能够盈利；即便是在1860年代的鼎盛时期，修建者向投资人许诺的红利也从来没有兑现过。