This is a hypathetical situation. If it was happening, I wouldn't use real a real name or location. Let's say a nice guy from a place like Missouri sold some higher end chips to a guy that lived in a far away land like maybe England. We'll call this guy Sprigg. Ok, our hero is going to Las Vegas, and to save a lot of trouble he is going to deliver the chips to Spriggs friend in Vegas. Let's call him Grumble. Our hero and Grumble are meeting for lunch to socialize and deliver Spriggs chips. My question is , should Sprigg buy lunch for these two gentlemen? Should Sprigg also leave the tip? (they might not do this in his country from what I've heard) If he refuses to pay is it OK for Grumble and our hero to say terrible things about him? Thanks for your opinions.