Yes, that is priced at up to $50 per 50 lb bag. Think of this in these terms: What other fertilizer you have used that covers at least an acre per bag? For me, liquid fertilizers are a way to give premium results at a reasonable price. The nearest equivalent to what I apply to a lawn would be a greens grade fertilizer made with MESA, potassium sulfate not potassium chloride, no urea, and a complete chelated micronutrient package. Have not found a granule even coming close to those specifications for less than $300 per acre. I can formulate a liquid for no more than $200 per acre where the color lasts for more than 30 days.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738