It's legal in OTHER countries to change your own crystals. They have different situations to comply with than we do here. TH sells worldwide and also to authorized shops here. There is no reason not to sell the product, it is up to the purchaser to know what is legal for him to do with it. Much like you can buy a gun from a dealer but it's up to YOU to know that it's illegal to kill someone with it. You can buy a Corvette that will drive at 150 MPH but it's illegal to do so on virtually all roads.