Bravopilot
Sorry F/B means food and beverage. I see what these gals receive as tips and its pathetic most times. I'm not rich, am semi-retired with no pension, work 2 minimum wage jobs and do a few other things but always tip at least 20% minimum on food or drink I purchase.
IMO, its customary to tip the bag drop who loads/unloads you bag , maybe cleans your clubs. That rarely happens at our course which is mid-high end pay as you go. I notice that it is pretty standard when I visit the US ( I did 3 US golf trips this year = Florida, Wisconsin and Phoenix )
This time of year we start to get lots of private club guests as their courses close earlier. They are a bit better probably because they are used to it. Personally, I don't care if they tip me at bag drop/back shop but the Food and Beverage staff should are all Uni kids making minimum wage and work very hard. Our best tippers are the seniors in Senior league .
Here and there I have to deliver food to people on the 10th or 11th hole because they didnt follow the signage on 8 that says order your food here so its ready for you at the turn. Service with a smile and Maybe get a tip 1/10 times ....I just give it to the kitchen staff