To accumulate 2-3 million, skills plays a bigger role than luck. One does not need good luck for that. The absence of bad luck is a sufficient condition. Lots of successful professionals who are good at their job belong to this category.
To accumulate 20-30 million, you need lots of luck besides being very capable. Such a person is probably a successful entrepreneur or CEO of a big company. HNWIs who got rich through this route and admit the role of luck are humble and intellectually honest. I like them.
In the course of my engineering work, I have worked directly with entrepreneurs. Several are smarter and definitely more diligent than me. They worked until they forgot some days are weekends. Some opened up to me. I realize that there are several things that must not happen in order for their business to even survive, especially during the early start-up days. These things are beyond their control. For example in today's context, high currency volatility. Businessmen are not currency speculators but some are affected by currency movements nonetheless. If the business imports electronic components priced in USD but sells finished goods priced in SGD, their margin is going to be severely eroded since middle of 2014, particularly if the business lack the pricing power to raise prices. Extreme forex volatility may cause them to hedge at the wrong time assuming purchase orders are large enough to even do hedging. To accumulate 20-30 million, being capable, diligent, passionate is not enough. You need good luck. The absence of bad luck is not enough. You need good luck.
For the average income Singaporeans who wants to accumulate 2-3 million, it is still possible. You don't need good luck. You need good financial habits such as saving money, a good working attitude plus some stomach for risk-taking to invest. Just be patient and don't try to get rich quick when you invest. By the way, like the HNWI individual who humbly admits the role of luck in their success, the majority of average income Singaporeans who cannot beat the benchmark indices better admit they cannot DIY. So, have the intellectual honesty to admit you cannot do well DIY and invest in passive index funds or ETFs. As your wealth grows, diversify to protect it. Concentration is for the gurus, not wannabes.