They are the ideal tools for companies who lack the financial resources and / or the staff required for generating spreadsheet solutions with specific programs. At present, the most requested types of ready-made spreadsheet solutions are "Spreadsheets for Small Business" and the subcategory "Spreadsheets for Actors".
One user at a time : In the instance where there are a number of people required to work on a spreadsheet, they can only access it when no-one else is working on it.
You could make money doing something you love (or like [or maybe not so much but just really good at]). It's great to see a spreadsheet come together, and usually a lot better than what you originally envisioned. Especially when the dang thing works.
Protection of formulae : How often have you forgotten to protect the cell contains the formula that took you hours to test and perfect. It takes one instance of honest human error, and that formula is gone.
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