To touch on your example, you're not allowed to tip that individual starbucks employee who went above and beyond while everyone else is shuffling along. You can tip the whole team, which gets split among everyone working according to how many hours they worked that pay period, or not tip.

To me, a tip goes to an individual, not everybody who happened to be working whether they helped me or not. This is one thing I really object to in places that have a general tip jar. I tip individuals, not companies.