I've certainly read a ton of financial reports in my day, and when I started playing OOTP last summer, I did spend a little time trying to figure out the financials in the game. I got over that notion pretty quickly.
Like other aspects of the game, I suspect that asking for incremental improvement is the smart move. Just getting the front office financial display to make more sense would be a substantial improvement, without worrying too much right now about whether the actual numbers were historically realistic.
Just my