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.
By requesting the services of such specialist spreadsheet-solution-providing companies, business owners can rest assured that their needs will be met with precision, dedication and professionalism. Such companies are empowered by experienced teams of Mathematicians and Microsoft Excel Spreadsheet Designer/Programmers whose goal is to surpass the requirements and desires of their clients.
At present, some of the most requested types of spreadsheet packages in the market are: 'Spreadsheets for Small Businesses' and a subset of that: 'Spreadsheets for Actors'.
When your spreadsheet start to hit its limits, what options are open to you? Perhaps the best option is to consider the conversion of your spreadsheet to a database solution. Relational databases became viable not too long after the spreadsheet was well-entrenched as the affordable and quick means of gathering data and performing calculations.