Quoted from Duvall:The seller (also a professional looking fellow) started to count my hundred dollar bills as I stood there as if I would have tried to short him. If I get the sense a buyer is a decent person, I never insult them by treating them like a convict transferring prisons and I got pretty insulted almost to the point where if I felt any less trusted, I would have aborted. I therefore never count money in front of someone I feel is a stand-up person. We all have our proclivities i guess. Could I easily get burned this way? Yes.
I always count in front of the person -- as a buyer or seller. It is not about trust, is is about making a mistake. We are exchanging a lot of cash (e.g., lots of pieces of paper) and mistakes can happen. I'm never insulted when a person does it in front of me (often joking, this is the part that feels like a drug deal). Once I almost shorted a person $100 and once I was almost overpaid $100. I just make it clear what I'm doing and why I'm doing it. In both cases, the error was caught and all was made right.