Why does this product seem so expensive?

Because you only need 1 – 3 sprays of product to remove your worst odors, you will get at least 100 rooms out of 1 - 16 oz. bottle and it will cost you about $0.75, compared to the high cost of using an ozone machine, odor bombs, or foggers. With 2,100 sprays per 6 pack, you will likely only need to reorder this 1 – 2 times per year. You will save hundreds if not thousands of dollars while increasing quality scores.