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.
Serving for a multitude of purposes and being renowned for their efficiency and reliability, spreadsheet solutions have a major contribution to business management and development. Existing spreadsheet solutions are no longer limited to accountancy processes (monitoring financial data, managing budgets and facilitating a series of data manipulation processes); they can also be successfully used as means of business analysis, organization, as well as forecasting, allowing companies to gradually expand, achieve better exposure and neutralize the competition.
All of these things pull you away from the thing you really want to do...which is to build and sell great spreadsheets. The best thing to do is use Excelville.com since they have web developers and internet marketing specialists to help get exposure for your spreadsheet.
Selling spreadsheets helps you to build a catalog of spreadsheets that you can take with you and use in various areas of your life. Spreadsheets built for sale are usually built for flexibility and would be customizable to your life, or job, or new life, or new job.