Why Is Pink Himalayan Salt So Expensive

People swear by Pink Himalayan Salt, and I even used it last night on the rim of our margaritas glasses. But why is it so darn expensive. I did find a big bottle of the stuff at Target that was cheaper than anywhere else I have found so far. So that's now my go-to. However, is there any benefit? Not sure, but even placebo works sometime...ha-ha!