You'd think... but bigger distributors don't care as much and they expect the user to be responsible for themselves and know their limits... which they don't. People are also using it in other drugs. You sprinkle a little bit on some weed or cut some cocaine with it and your customers will consume more and come back to you before looking elsewhere... they'll also on board other users to your clientele list.
But you're not putting the entire dose into something someone is going to consume all at once... presumably.
That being said, it's a terrible creation of man and should be eradicated.