Films are among the most risky investments a person can make. Unfortunately, most filmmakers, and even worse, investors, are unaware of this. If mortgage-backed securities are like keeping a pet tiger, film investments are like keeping a pet wolverine, with rabies. Odds are you will be bitten, badly.
This being said, there actually are reasons to make films. When films do succeed, the returns can be astronomical. Forget about 60% internal rates of return, we're talking well over 100%. Another reason for filmmaking is that film is art. The message behind a well-crafted feature can yield priceless returns to the people who see it. Making a movie with the latter goal in mind is best, and if the financial goal, miracle of all miracles, somehow gets met, all the better.