Why the Investing Advice You Grew Up With May Be Costing You
In today's markets, something important has shifted.
The old rules of investing — the sayings passed down from one generation to the next — aren't holding up the way they used to.
Much of what feels like common sense is quietly costing real money.
In this episode of Money On Tap, we unpack more than ten of the most expensive market myths still guiding investor behavior — and walk through the statistics that tell a very different story.
Because the truth is, disciplined investing isn't about folklore.
It's about facts.
The Tax — I Mean the Time — Problem: Why Timing the Market Fails
One of the most important numbers in all of investing is surprisingly simple:
If you missed just the 10 best days in the market over the last 25 years, your annualized return would be cut nearly in half.
Here's what the math actually looks like:
- Fully invested: 7.98% annualized
- Miss the 10 best days: 4.54%
- Miss the 30 best days: 0.47%
- Miss the 50 best days: -2.62%
That is the real cost of trying to "time" the market.
And those best days almost always cluster right after the worst ones — meaning investors who panic-sell are the most likely to miss the recovery.
In investing, time in the market beats timing the market — by a wide margin.
The Sell-in-May Trap: Why Old Sayings Don't Hold Up
You've probably heard it: "Sell in May and go away."
It's catchy. It's even chiseled into stone in some corners of New England.
But the numbers don't back it up.
Since 1950, the average S&P 500 returns for May, June, July, and August have all been positive.
The single worst month historically?
September.
Which is right around the time a "Sell in May" investor tends to buy back in.
The Cash Comfort Myth: Why "Safe" Quietly Costs You
Many investors feel safer holding cash.
The problem is that "safe" and "growing" are not the same thing.
Consider $100,000 invested back in 1992 and held through 2025:
- Bank / cash: ~$228,000
- Municipal bonds: ~$313,000
- Corporate bonds: ~$559,000
- Gold: ~$980,000
- Russell 2000: ~$1.73 million
- S&P 500: ~$2.8 million
Cash trailed the S&P by a factor of more than 12 times.
You didn't lose any money. You also didn't keep up with your life.
Inflation, not the market, is the slow leak in most retirement plans.
Is Investing Just Gambling? The Numbers Say No.
This one deserves a direct answer.
Gambling is a statistically negative game.
- Blackjack: ~49%
- Roulette: 47–49%
- Over time, the house wins.
The stock market is the opposite.
The S&P 500 has been positive in 73% of calendar years.
Investors don't buy stocks expecting them to go down — they buy them expecting them to go up, and more often than not, they're right.
Due diligence turns investing into ownership. Without it, you're just placing a bet.
The Diversification Illusion: More Isn't Always Better
Many investors believe that owning more stocks automatically means a safer portfolio.
The data says something different.
A study of two portfolios shows the problem clearly:
- 531 carefully chosen holdings: 9.45% return, -19.3% max drawdown
- 2,935 holdings (over-diversified): 7.33% return, -26% max drawdown
More holdings produced lower returns and larger drawdowns.
True diversification is about quality across sectors — not owning everything.
The Bonds and Gold Myths: "Safe Havens" That Aren't So Safe
Two of the most persistent myths involve assets people reach for when they're nervous.
Gold: Averaged roughly 6.3% over the last 15 years. The S&P 500 averaged 14.9% — more than double. Gold has its place in a portfolio, but it is not a substitute for one.
Bonds: Not risk-free. Bonds carry interest rate risk, inflation risk, duration risk, and reinvestment risk. A 4% yield in a 5% inflation world is a losing trade.
"Safer" doesn't mean "safe." It usually just means a different kind of risk.
What Actually Works: Discipline Over Folklore
Stripping away the myths leaves a short list of what actually builds long-term wealth:
- Stay invested through volatility
- Diversify across quality — not quantity
- Use dollar-cost averaging intentionally, not as a default
- Coordinate distributions with a tax plan
- Rebalance on a schedule, not emotion
- Let compounding do the heavy lifting
None of this is flashy. All of it works.
Final Thoughts: Why Action Matters Now
Every investor is telling themselves a story about their money.
The question is whether that story is true.
Most market myths survive because they contain a kernel of truth — but the conditions that made them true have changed.
Acting on outdated investing rules in 2026 isn't conservative.
It's expensive.
Next Steps
If you would like help evaluating your current strategy, reviewing your portfolio, or stress-testing your retirement income plan against these myths, we invite you to schedule a conversation with our team.
Call: 855-226-8551 Email: info@yourmoneyontap.com
Frequently Asked Question
What happens if I miss the 10 best days in the stock market? Missing the 10 best trading days over the last 25 years cuts an investor's annualized S&P 500 return from about 7.98% to about 4.54% — nearly in half. Miss the best 30 days and the return falls to about 0.47%. Time in the market matters far more than timing the market.
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