I think it's a bit of a hypocrisy saying that I'd gladly pay to roleplaying pirates, but not the rest.
I found that even a "2milordie" pirate adds to my immersion - as in making Sirius more dangerous.
Also the amount of roleplay (typed lines) depends on the traders reaction. I don't know how you act, but even the most sophisticated pirates can't do much more than dropping some preset lines if the target doesn't stop after a CD.