Originally Posted by
Quizatzhaderac
If you want to be thorough, you should have a table of prices. Goods X places. The whole point of shipping is that things are different prices in different places. And people aren't going to ship through pirate infested waters for a low profit margin. If you don't want to be thorough, just write the prices for the base and keep in mind prices at the base may be very different than other places.
If the base is a secret pirate island or something, basic goods like flour, rice/ beans, drinking water, juice, meat, cloth, et cetra might be much much more expensive than normal since the island is separated from legitimate society.
Also in a fantasy setting the crew are going to expect potions of cure disease and cure wounds. If the listed prices aren't too your liking you can make cheaper versions good enough for NPCs.
With trade goods a pirate might be getting selling for much, much less than the final destination's price. The buyer's have all the risks and expenses of a legitimate merchant, plus extra risks from authorities and dealing with criminals.
Some extra goods for fantasy flavor:
Rutile, or Anatase: minerals used to make adamantine. Generally nobody knows how to process them. (IRL titanium ores, processing is much more expensive than the ore and most places can't do it economically)
Depleated Kimberlite: diamond ore with the big diamonds taken out. Someone somewhere else knows how to extract diamond dust from it.
Amber: About 1.5 gp per pound today. Could be justified for a wide variety of vaguely magical things.
Elderwood resin: No idea what it's for, but it sounds fantasy-yl maybe elves export it.
Monster ivory: Fantasy worlds are filled with large creatures with big teeth and tusks that are constantly attacking adventures. Not making it into things would just be wasteful.
Figure out about how much money you want them to be able to make, and how many times they'll be able to attack ships. If you want to be more sure/ handle the fact fact that they''ll be able to attack better ships build a spreadsheet. Columns: money (current) money (total), ship quality (maybe many), expenses, gross income, net income.