Poker dealers are the true captains of the table. Players and tournament staff alike trust them to facilitate a successful game, one characterized by speed and accuracy. Most of the time they do a great job, but over the course of tens of thousands of hands, mistakes are bound to happen. After all, they’re only human.
Some people come down on dealers when they make a mistake (they’re an easy target when someone is tilting or generally just an a**hole). Meanwhile others reward them for either a big hand or good run of cards (tipping isn’t a city in China).