I think there is a major balancing issue with Investments.
In Ultimate Campaign.
I can work as a Innkeeper for 2 GPs per day.
Buy/build an Inn for 2130 GP(52 goods, 5 Influence, 47 labor)
Rooms: Bar +10gp, Bath +3gp, Bedroom +3gp, Common Room +7gp, Kitchen +4gp, Lavatory, Lodging +12gp, Stall +9gp, Storefront (+5 capital?) 49gp a year.
Or invest 2000 GP into Tavern, where I could lose money on a failed year or from 20GP to 200GPs at best 10% return on a breakout year.
It seems that it would be better to not spend the gold and just work a job in your off time.
I understand you get the gold back if you want, so long as you don't have 3 failed years in a row. I also understand an innkeeper job might not be open for a 2-5 days of rest wile other party members heal/work on X,Y,Z.
Or if your character works as a bard you can make some good coin at a busy Inn.