Wine sales are based on the commission of wine sales+tips voluntarily given by guests as income. Public relations doesn't take commission, unless she pulls the guests to book private rooms and there is a fixed tipping standard according to the level of clubs /KTV/ luxury houses, the guests must not tip less, otherwise the public relations will react with the leaders of the reservation business (booking mommy) or the company's public relations department, and the business or leaders will come forward to ask the guests to make up the tips.