That’s the difference between outdated V&B testing on most product labels and modern AOAC v. 97 (ISO/LAMAR) testing. Ferti Organic is a good company, I personally used them for years. V&B testing inflates the inactive ash content, so 90% “fulvic acid” ends up being ~14% ISO/LAMAR. AGT-50 also has amino acid chelates and organic acids found here that no other product on the market has:
https://www.agtonik.com/agt-50-organic-acids
Our product ends up being $0.01-$0.025 per final gallon drench and foliar depending on product strength used. I’d be happy to send you my personal (not just business) phone number or any product information to show you why it is a superior product.