Spreadsheets are amazing. They have made handling complex mathematical scenario modeling available for everyday people. Through spreadsheets, anybody can handle huge amounts of data from multiple sources, easily manipulate the data, do calculations, summarize, and visualize the results. The learning curve to get started is extremely low, and the possibilities of what you can do are nearly limitless.
This leads to spreadsheets becoming the stopgap in any scenario requiring tracking and manipulating data. Rightfully so, they are often the first place people go when they need to track orders, handle financial records for their business, or as we commonly see, manage commissions.