With Power Pivot, things have changed. I have so much more flexibility to write the DAX measures I need, which leads to many more columns being defined. If you think about things like forecasting an annual cash flow statement, I’ll write at least 13 different measures (one for each month), plus a total. And that’s just one scenario. For a regular financial statement the same thing… Actual, Budget, Variances, Year to date Actuals, Year to date Budgets, and so on. Again, it’s not uncommon to see a statement with over 12 columns.