According to the invoice picture you provided, the salary of $580 refers to the payroll tax that needs to be paid to buy this necklace, which is the so-called "service fee". In Hong Kong, the sales of some high-end goods such as jewelry and watches may include payroll tax, which is to ensure that merchants provide quality after-sales service and service experience.

If you are not sure whether you have been cheated, you can consult Zhou Shengsheng customer service to find out the real price and service charge of the necklace. In addition, if you think you have been cheated, you can contact the Consumer Council of Hong Kong or local authorities to complain about rights protection.

Whether other netizens have experienced similar situations requires specific analysis. If you think being cheated is a common phenomenon, you can consider initiating discussions or complaints on social networks or consumer rights protection platforms to attract more people's attention.