[aes256]

Because it is ubiquitous, there is constant demand for it, a consistently high retail price, and there are plenty of retailers willing to fence it in large quantities.

[hyperbovine]

Interestingly, it would also be rather easy to counterfeit, assuming the fragrance isn't impossible to nail down. Wonder how long before we see that start happening...

[pixl97]

Collect empty bottles and fill them with cheap blue stuff, put a layer of real tide on the top for the smell and viscosity. Probably already is.