楼主并没有提人种等，只是抱怨Shell。这个不是占便宜的问题。分享使用合理合法。老外share Shell或者Petro Canada洗车卡多了去了，楼主主要是在“占小便宜”前没有调查深入的研究。。。
五块钱, 那么多水电洗涤剂, 还有机器人工的维护成本. 商家亏死了 ...
是，既然定出了这个价，带着漏洞，就不能不许顾客钻，不能不让使用洗车间，认为吃亏了可以今后改规则。As long as it's legal and abide by the user agreement, you cannot criticize it's 钻了商家的空子. Please remember: by attracting more people to wash their cars at their gas stations, Shell will actually gain more business benefit and potential revenue than you first thought: more visitors to their gas stations may generate more gas and other merchandize sales, and even help build long-term customer relationships.
当年有人从bell和rogers之间换来换去享受三个月免费，就遭到过批判，可笑。商家都不会嫌弃这种行为的，旁人看不过去了For some public companies like banks, they may even offer ridiculous cash rewards to attract new customers, ignoring the fact that most of these new customers may not stay after receiving their rewards. However, there are business reasons to justify such business model:
Again, before we blame smart customers to "abuse" a business promotion, we should not forget that it's probably the business mangement who is wiser.
- Even a small portion of stayed customer will, in the long run, more than compensate the cash rewards they've "given for nothing".
- Attracting many new customers will make one public company's short term revenue and balance sheet so much better, help them meet their seasonal or yearly goals, and make their management ready to receive bonuses
- Each new customer will bring some of their personal information to the company. Client data and privacies can really worth a lot.