Because they're probably buying it off Amazon someone actually brought it to their doctor because it smelled so bad and they said it was fake. Which is why I don't ever buy anything like that off of Amazon it's easy to fill the bottles and say this is what it is.
Reason I didn't like the smell it is because it's shipped and sold by Amazon... I wouldn't buy any of this kind of stuff off Amazon if you look in the comments somebody took it to their doctor and their doctor confirmed it's not real it's fake.