Cisco Took 25 Years to Make Investors Whole Again After Its Dot-Com Crash. Here's What That Means for Traders Buying NVIDIA Now.

There's always a strange nervousness that comes with trying to price a company that no one doubts anymore. Unlike those messy, "misunderstood" names that are easy to dig into, a company everyone already likes gives you almost nothing to push back against… except for maybe some far-fetched speculation. And that's exactly why it's the process of digging into those messy names where investors usually find their edge.

I'm not talking about those speculative artificial intelligence (AI) infrastructure bets that are clearly overvalued, but those well-established names with the deepest pockets that even the most conservative investors pour money into.

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With those companies, the bright future has already been imagined for you by everyone else in the room, and it's already baked into the stock price. And that is where many investors fall into an unintended trap.

That's because when the whole world believes, doubting it feels like being a silly contrarian. Following the herd just feels safer, which is exactly backward. After all, a great company and a great investment are two entirely different things, and more often than not, the gap between them is the cost of entry.

Don't believe me? Ask anyone who bought Cisco (CSCO) at its 2000 peak.

The business did everything right for the next 25 years, and the stock still needed every one of those years just to get investors back to even. A generation of gains, gone – and not because the company failed, but because the price already assumed perfection.

So, today's piece is all about how I value stocks the market is already in love with, a.k.a. the Wall Street darlings. Specifically, I'm looking at the current Magnificent 7 - I say "current" because we all know they're only magnificent until they're not.

In the markets, love is the hardest thing to price in because it already paid up for the future. But the harsh truth is that even companies with flawless execution might still hand us nothing better than an average return. That's because the growth opportunity we're paying for was already promised.

And usually, the disappointment doesn't even look like a failure when it comes. In most cases, it looks like success that simply matched what the price was already counting on, and history has a way of repeating itself almost word for word.

Let me give you another example. Back in the early 1970s, an informal group of stocks nicknamed the Nifty Fifty was treated as a forever holding. The investors' thinking was that you would buy them, never sell them, and that the quality made "any price" worth it. That felt smart because it wasn't wrong about the businesses themselves.

Anyway, by 1972, the average Nifty Fifty stock had pushed past a price/earnings (P/E) ratio of 41, while the broader S&P 500 Index ($SPX) sat near 18x. Xerox (XRX) and Polaroid, for instance, carried multiples of roughly 46x and 91x, respectively, at their peaks.

Now, a quick explainer in case you're unfamiliar. The price-to-earnings (P/E) ratio is the stock price divided by the company's annual earnings per share. A higher number means investors are paying more for each dollar of earnings. Take Polaroid's 91x figure from above: that means investors were paying $91 for every $1 of Polaroid's annual profit.

Going back, the excitement around the Nifty Fifty wasn't driven by companies dressing up to look strong. That group consisted of many of the best businesses in the United States, and for that reason, the illusion of safety was the biggest risk. The quality convinced investors that the price didn't matter in the first place.

So what happened to them? Well, the stock market meltdown of 1973 and 1974 hit the Nifty Fifty harder than the broader market. And of course, the priciest names on the list fell the furthest.