Most business people don't value and appreciate correct software. It's odd but shouldn't be surprising that most people are unable to effectively evaluate the risk of a software defect, especially in a tool like excel.
I don't think it's that odd. Marketing in general is the art of ignoring edge cases, focusing on majority tailoring. Why would I care about losing 1 customer due to changing our branding, if it gains me 1000?
This is why business is not considered a form of engineering, while software is (just barely). Imprecision is a tool in business, while in engineering it is an enemy.
