Investors may be overly optimistic about the company's future performance given its high P/S ratio and recent revenue decline. This could lead to disappointment if the P/S ratio aligns with recent growth rates. The company's medium-term performance doesn't justify its high share price.

The declining capital employed by Qingdao Zhongzi Zhongcheng and rise in current liabilities raises concerns. Despite a 30% stock increase in 5 years, it may not promise the multi-bagger potential some investors seek.