Not sure which part you mean, but the important bit for this thread is that even basic Excel formulas are black magic to non-techies, and that basic hacking skills can drive real business value. There are things you can do rather trivially, such as "Add 3 calendar months to this date, and if it's later than this other cell, color the cell red," which would be a) extremely helpful, and b) otherwise a task they'd have to hire an intern to calculate each week, for many companies in the $1-20 million a year range.

And this is just Excel formulas, let alone the ability to write some VBA that does calculations and draws a chart, or a script with a regex that cleans data files, or a basic app for data entry...

If it was the ISO certification you were interested in, there are many certifications related to manufacturing, food & drug, etc. These certify that your company meets various standards, regulations, quality procedures, documentation policies, tolerance assurances, etc. These can result in a ton of additional business, since many customers desire or require them, and losing them is also a big deal. The certifiers audit companies regularly, and having some pretty spreadsheets that show how you are continuously improving and ensuring your adherence to the regs can be very valuable!