Did you guys not read the fucking article? They had to get their own napkins, re-fill their own drinks from the bar, and wait over an hour for the salad. Fuck that noise. Why should they have to tip?
They could have handled it differently -- but the principle is the same. Everyone wants a damn hand-me-out. Do your fucking job. Does your mechanic pop 18% on your bill because he didn't blow your car up? No.