Hello,, i have a question and is like some opinions on how best to handle it. Long story short its homebrew campaign and the 1st part the party is sent on a long journey to recover some kidnapped townspeople and a dukes daughter. This takes the group across the previously uncharted western sea.
They discover a new continent that is less advanced than the main land. During the course of the adventure the party claim a couple of pirateships and rescue the prisoners. They decided to set up a local factor while on this new continent for later trading operations. They then return back across the sea to the mmainland.
The duke rewards them with titles and a large section of land which we use to run a kingmaker style 2nd story arc. Now they are shipping products back and forth across the sea and i am unsure of the amount of returns on investments to give them.
Anyone have a good method for determining something like this? So far they usually send about 5k worth of goods and i just roll to see if they get that amount, double, or triple back. Any suggestions would be welcomed.