This may surprise you but I do not leave a tip in upscale restaurants. Most of the time. When they add a service charge of 10 per cent, as many of these restaurants do these days, I assume the money goes to the staff that has served me. After all, it is for service. It is the tip. The only difference is that it is added to the bill instead of leaving it to your discretion. It is intended to protect the employees from tight-fisted customers who might leave less, or sometimes nothing.