People tend to focus too much on risk and too little on growth. The reason why it is realistic is this. Suppose you pay $21 for the stock now (fair value). If things pan out you will quadruple your money ($85) in four years time. If not, and SIAF turns out to be a fraud or the business model fails, you lose your money. Seems like a fair trade-off to me. So you can see how immense important EPS growth rate is. And we have 50% for the next three years!
Or less. Because you only need 50,000 shares to make a couple of million. Depends on your appetite for risk and how much money you want to make. Personally, I would be satisfied with $2 million.