Selecting a good C-41 kit / Separating blix into bleach & fixer.

[dcy]

It also might be that you need the water as well in order for the mixture to have any longevity. Water is, of course, a chemical too.
And packaging, shipping and storing water costs money.

Sometimes I wonder why our society spends so much money storing water and moving it around in trucks when it literally comes out of a numerous pipes around my home. My toilet cleaner is 97.6% water and 2.4% bleach. You'd think the default would be to buy a concentrate and add water.

 

[Spektrum]

There are several reasons for this:
1. Gigantomania – I'm not sure if this is the correct term for this type of purchasing preference among shoppers. People buy with their eyes. Looking at a store shelf, they choose a product that appears to contain more, based on their visual assessment. For example, when looking at other products in a 1-liter package, they will likely choose these products over a highly concentrated product in a tiny bottle, even though it's clearly labeled a concentrate.

2. Purchasing habits – for years, people have been buying this product in larger packaging (for example, a 1-liter bottle). If a manufacturer intends to switch to concentrates, they must consider that potential buyers will perceive the product as a reduced quantity at the same price. They will feel cheated and may abandon the brand altogether. It's too much of a risk for the manufacturer.

3. Safety - A highly concentrated product can be very dangerous. For example, it can be highly corrosive and pose a risk of burns. However, the same product heavily diluted with water poses no such hazard.