Just a thought, not a serious suggestion. What if the dev added random events to make it more realistic, like "tax assessors accuse lemonade stand of not having proper permits", "govt. regulates trans fat", "EPA determines oil well has negative impact on environment", ect. Give 4 options when these happen: pay a fine, get 0 profit from current run, close one affected business, fight injunction (more costly than the fine).
I saw a flash of relief in the eyes of my dolphin as the clock ticked to zero milliseconds before he careened into the sea floor on his meteoric return trip from mars.