Exactly, like most of the things marketed for flowerhorns, or more accurately, marketed for flowerhorn keepers.
$120 for 1kg of this product. WTF?
Osmoregulatory stress (caused by shipping/transport) is easily reduced by using common salt (sodium chloride) - one of the exact same active ingredients in this overpriced product, and if one feels the need to add mineral content to their tank water there are far less expensive ways to go about it, such as using marine salt mixes, crushed oyster shell, crushed coral, as filter medium, etc.
Don't be sucked in by the FH marketing gurus, or any of the vendors that sell such products.
Your lo$$, is their gain.
that's all I needed to know