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.
Many spreadsheet applications nowadays have functionality above and beyond the traditional, offering a variety of charts, look-up tables, databases and more functionality than can be mentioned here.
Elaborate, properly constructed spreadsheets greatly simplify a wide range of activities and processes within companies, enabling business owners to economize valuable time and effort, increase the efficiency of their business (Analysis), keep track of different tasks, manage their budget, optimize the planning of future events (Forecasting), organize and access valuable information, and optimize the completion of specific tasks. And thus, thanks to their many benefits, spreadsheet programs have come to be considered indispensable tools for businesses in today's competitive climate.
You may also want to track your current spending on one sheet with columns for different categories. Some individuals will list the budgeted amount in one column and then list the actual amount spent in the column next to it.