You’re probably right.

[Here goes Atsushi’s attempt, though the owner looks confused as to why this group hasn’t left yet.]

Um, sir, sorry to bother you again, but do you have any other advice for us? Maybe about how to get the best deals while bartering?

”Well...since you’ve all been so polite, I advise procuring some tea for the curio shop owner. That will make them much more open to negotiations.”