I would NOT rely so much on random rolls for everything! Rather, I would present her with certain challenges regarding the running of her business, and reward her based on how well she deals with those challenges.
For example: The guy in charge of running the plantation for her is screwing her over (stealing sacks of beans, getting paid by a competitor, or just plain incompetent). If she doesn't correct this, the plantation will suffer a significant loss this year. Doesn't that sound more interesting than rolling a 3 on a d100?
I would essentially work backwards to figure out her "default" ROI, then adjust it up or down depending on how well she manages the business, and optionally add in a small random factor. For example, let's say you would like the business to pay back its investment over a period of 15 years. If she invests 250K, that means you should aim for an average net payoff of 16.7Kgp per year. Whether she actually makes that or not depends in large part on her involvement, not on a simple roll of the die!
Of course, you can still roll for things like weather, attack by bandits, etc. But if she's set up things efficiently, she may actually be able to circumvent a lot of the effects of these. She's an epic-level character, right? The plantation overseer tells her (via a Sending for example?) that a major tropical storm is brewing... so she hires a high-level druid and teleports to the plantation to protect her crop! Bandits in the area? Nothing that a party of epic-level PC's can't solve...
For example: The guy in charge of running the plantation for her is screwing her over (stealing sacks of beans, getting paid by a competitor, or just plain incompetent). If she doesn't correct this, the plantation will suffer a significant loss this year. Doesn't that sound more interesting than rolling a 3 on a d100?
I would essentially work backwards to figure out her "default" ROI, then adjust it up or down depending on how well she manages the business, and optionally add in a small random factor. For example, let's say you would like the business to pay back its investment over a period of 15 years. If she invests 250K, that means you should aim for an average net payoff of 16.7Kgp per year. Whether she actually makes that or not depends in large part on her involvement, not on a simple roll of the die!
Of course, you can still roll for things like weather, attack by bandits, etc. But if she's set up things efficiently, she may actually be able to circumvent a lot of the effects of these. She's an epic-level character, right? The plantation overseer tells her (via a Sending for example?) that a major tropical storm is brewing... so she hires a high-level druid and teleports to the plantation to protect her crop! Bandits in the area? Nothing that a party of epic-level PC's can't solve...