Have the ingredients for the health drink been approved by the FDA? You don't have any idea what is in it and I am always cautious about so called "herbal or natural" remedies. Foxglove is natural too but it can kill you because it is what they make digitalis from.
As for getting other people to buy in so you get your money, how many people in town are there left to join? With all pyramid schemes, only the first few actually get money.