The idea that you can predict how much you might be able to make or lose based on various factors is something that most people find very appealing. You can do so by running a profit and loss projection with an excel sheet. You can do this by just plugging in some of the factors that they already know about their current operations.
With this information, you are able to see what the program can tell you about how much you are able to make or possibly lose based on what you have been doing so far. It is a great way to attempt to predict the future.