[cykros]

It's all about picking the right tool for the job. I don't see easily constructing a Discounted Cash Flow model in a relational database making a ton of sense. Sure, you could have the data in one, and use a php script to handle the modeling, and output it on a webpage, but the reality is, a spreadsheet just does it a lot easier, and is what most people would want.

For handling structured data, spreadsheets can do it, but they're not always going to be the best tool for the job, as they do a lot of other things, too, which means if you're not careful, your data will lose its appropriate structure.