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How exactly do affluent individuals leverage their resources to further multiply their wealth? Could you please elaborate on the strategies and mechanisms they typically employ to optimize their financial portfolios? Are there specific investment vehicles or financial instruments that are particularly favored by the wealthy? Also, how do they factor in risks and ensure sustainable growth while leveraging? Additionally, are there any common pitfalls or challenges that they often encounter in the process? I'm keen to understand the intricacies and nuances of leveraging from the perspective of the affluent.