Carmakazi

In no particular order:

1. ACU/UCP is pretty irredeemably ugly for casual wear. Maybe it will find a niche following among cyberpunks in 20 years or something, who knows.
2. It may still have a connotation to official US Army uniforms that people looking for casual wear don’t want to make. The classic “woodland” camo is far enough removed from this.

It is in basically every surplus store, and it is cheap…because hardly anyone wants it.

IIRC Burger King was one of, if not the first companies to use computerized inventory/bookkeeping. And they used it to try and crack down on employees giving away extra food. It was a giant waste of money.