Who gets to dictate what a primary use is? There are millions of acres that get gypsum every year exactly for the purposes we're stating. We can put on S cheaply, safely, and don't have to scour the earth to find it. How much does it cost to put these fertilizers on to get up to 40lbs S/acre, and where do you find these fertilizers? Where can Jane Cloverpatch get this stuff?
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I can tell you what we pay in the midwest, from Canada to Kansas you can get it at Menards for $5/bag.
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Making ear plugs outta cotton balls isn't a primary use of cotton balls, but it doesn't mean it can't work great and for little cost.