Dead Dea Salt

Last week, I bought 2 bottles of salt at Ang Mo Kio Hub. It's not the ordinary salt. It's from Dead Sea. It says that it can make one's skin smoother; reduce the fine lines; moisturize the skin and has anti-aging effect. I bought it at promotion price -- 50% discouunt. Originally it should be $75+/per bottle. But I got it at $37+/per bottle. On top of that, I was given one bottle of hand cream as well which the promoter told me worth $10+. Looks like a good deal. I tried in the evening, seems not that bad also. Yet I'm now still puzzled, salt should be very cheap right? Isn't that 30 cents per pack at the supermarket? Is there any difference? Can we apply that on our body?