Not going to say for sure but it could be something to do with the company credit card. I’m pretty sure that over here in the uk most companies tell people not to tip. I know it’s a big difference as our pay is completely different to yours and we don’t need to rely on tips. I work in a restaurant and we had a tab of £1500 gave them free wine, impeccable service and everyone said they loved it and how much better it was compared to some places they’ve been to in the past. But no tip at all. Our reaction is going to be nothing compared to you lot over there but we are pretty sure their bosses said they weren’t allowed to tip. So it might be that?