But I personally think that the issue is not really the requests made by pirates, but the traders themselves. Why? Well, I do notice that some traders are silent, quiet or they just drop one line: ''Greetings.'' People are too focused to powertrade that they just skip the RP and act as: ''Take my money and go away'' or ''Kill me, I don't care.'' That is killer mood that just make pirates killing traders.
It might be a bit cliché, but with a guide of how to RP or at least recommend to RP or even training how to RP can be a solution. But that's my two cents.