what i can tell you from my experirnce is production of Aloe vera is much more than demand. there is no such organised market for aloe vera. My suggestion would be first make a plan where would you sell the product. either you can sell to companies like patanjali, but they already have many suppliers, better go and consult with their sourcing "contractor" about how much he needs. Or you make your own products and get that marketed your self, but that will be quite risky. Once you are sure of market, then only go for aloe vera cultivation. it is eaiest to grow and will keep on multiplying.