Yeah, a bad week of tips will really open your eyes. Honestly, the best move is to track it for a full month. You'll see the real average, not just the good or bad days. That number tells you if the job is actually worth it long term. Sometimes you gotta be ready to walk if the math never adds up.
Man, tracking tips is the only way to see the real picture. I did it for two months at my old serving job and the average was brutal. That's when I finally quit.