On the chinese buffet place I regularly have lunches, they'd clear plates and refill drinks. So, I'd tip $1 for $5.75 bill.
For $5.75, you can get all-you-can eat lo-mein, kung-pow chicken, sesame chicken, roasted chicken breast, clams, shrimp, and desert.
If $1 tip seems too much for you, then perhaps you really need that $1 (italized for sarcasm).