[HONG KONG] Optimism is in the air. People are lining up like ants for what might be the world's biggest initial public offering (IPO). But who says buying into Jack Ma's Ant Group is a sure win? No doubt, the Chinese fintech giant is a rare gem, boasting enviable sales growth and profitability. Yet making money off hot IPOs is a delicate balance between margin financing and how many shares you expect to get in what can be a convoluted lottery process.