Beware: Famous money gurus’ advice could help destroy your finances. Why some multimillionaires get it so wrong (and what you can do instead)

Other high-profile advice can be just as blunt. Kevin O'Leary has suggested that people earning $70,000 avoid buying a home — a claim often criticized for overlooking regional cost differences and individual circumstances.

Dave Ramsey's suggestion that retirees withdraw around 8% annually (2) has been widely debated, with many planners warning that such a rate may not be sustainable and could increase the risk of depleting savings, especially in volatile markets.

The core issue is context. Much of this advice assumes what worked for wealthy individuals will work for everyone, even though most households face very different financial situations and constraints.

Social media is amplifying bad advice

The rise of financial influencers, or "finfluencers" (3), has worsened the problem.

Social media has become a major source of money advice, particularly for younger investors. A CFA Institute report (4) found that social media influencers play a growing role in how Gen Z learns about investing and makes financial decisions.

Accessibility comes with risk. Research shows the quality of advice is often (5) inconsistent or unreliable, and in some cases, the least skilled voices can gain the largest followings.

Part of the issue is that anyone can present themselves as an expert. Regulators warn that financial influencers often lack (6) formal credentials or regulatory oversight, yet still shape real financial decisions for their audiences.

That creates an environment where bad advice spreads quickly — and it can be costly.

Still, you shouldn't dismiss all guidance from wealthy investors. In fact, some of the most reliable advice is also the simplest.

Both Mark Cuban and Warren Buffett emphasize one key principle: avoid high-interest debt.

As explained by Nasdaq (7), paying off debt can deliver a return equal to your interest rate. For example, eliminating a credit card balance with a 20% interest rate is effectively a guaranteed return equal to that rate — far higher than typical long-term stock market averages.

Buffett also consistently advocates for low-cost index funds and long-term investing (8). He highlights strategies such as buying broad-market index funds, staying invested for the long term, and avoiding attempts to time the market.

These ideas are widely supported and, notably, tend to be more grounded and evidence-based than many viral money tips.

What financial advisers actually say

Professional financial planners tend to agree on a more grounded approach.

In MarketWatch (9), certified financial advisers repeatedly emphasize the same fundamentals:

• Pay down high-interest debt: Tackling debt before anything else prevents interest from compounding against you and frees up cash flow for saving and investing.
• Build a budget and emergency fund: An emergency fund helps you prepare for unexpected events — like job loss or market downturns — so you don't fall back into debt.
• Invest consistently over time: Consistent investing allows you to benefit from market growth over decades, even through periods of volatility and economic uncertainty.
• Diversify and rebalance portfolios: If a portfolio drifts too heavily into stocks after a market run-up, rebalancing back to your target allocation helps lock in gains and manage risk.

They also stress focusing on "needle movers" — major expenses like housing and income — rather than minor lifestyle cuts alone.

In other words, the most effective strategies aren't flashy or extreme. They're consistent, disciplined, and tailored to individual circumstances.

How to protect yourself

With so much conflicting advice online, the key is learning how to filter what you hear.

Start by questioning one-size-fits-all rules. Personal finance depends on your income, debt and goals — not someone else's success story.