WOW!!! :angry I cannot believe things like this go on :bat I really feel bad for the guy who bought the empty jar. Each crystal glaze is numbered and is registered to a specific person. Zymol takes this VERY seriously. I bought mine almost 2 years ago and I'm just about about half way through. I've must have done at least a 100 applications. So you can imagine if you're sending this in evry month or even twice a year. It's common sense guys. Zymol is smart enough and can figure out if you're giving the wax away to your biddies, selling it, etc. by the frequency of refills. If a pro isn't sending it in once a year, how can a consumer?