Regarding the tricks of the trade in bars, Song Yun, a boss who owns several of them, naturally knew all too well. These women were probably used by Su He to attract patrons, and they might even be Su He's employees. Then they would encourage customers to spend more.
Think about it, you were planning to drink two bottles, but when a sister sits down, would you have the heart to not order a few bottles for her to drink? But these sisters can really hold their liquor, and before you know it, you may have gone through two cases. And you can't possibly ask them to pay, right? Naturally, money starts pouring out of your wallet, and then they go up to dance or sing a song, and you're encouraged to send flowers — there goes another few hundred bucks.
Anyhow, in a bar, they always manage to make you spend more than you'd budgeted without you even realizing it.