Waiting until bar close is good way to save on off fees and drinks. Money saved can go to more tips to guy. Of course, in your case, it wasn't your intention.
But this can be a good cost saving strategy if you already have the guy's Line contact and you can wait till so late. The disadvantage is the risk of another customer taking him long time. Or even worse, a customer takes him short time and he cum and he doesn't have much cum left for you! 🤬