NFLX data by YCharts All of a sudden, Netflix is back in with Wall Street, which rewarded the company by nearly doubling its market cap in one day. It was not all that long ago that some high-profile players were shorting this name; its best days were "clearly" behind it. Now, it's a "must-own" name. Overnight. The truth, for both of these companies may be somewhere in the middle. I don't own either, and am not writing this column to tout or pan them, but rather to make a point. Small investors need to be careful of the information that they act on, and especially in taking a very short-term focus. When everyone and their brother is buying, when the hype is at its height, it's usually after the "easy" money, if there is such a thing, has already been made. Neither Apple nor Netflix as companies, are probably all that different than they were a few months ago. The stock prices however are remarkably different. There are probably a lot of small investors kicking themselves today because they bought Apple at the "top." After all, it was a "must own," everyone was talking about it, and it was clearly going much higher. There may also be renewed interest in piling into Netflix, now that it is again back in favor. I honestly don't know what either of these companies is worth, or where they are headed from here. What I do know is that as investors, in the short-term, we tend to bid up companies up beyond their true value, pricing them for perfection. Then we punish them too harshly when we realize that perfection is unachievable. It's the oscillation between greed and fear, and too often, it's the small investor that gets hurt in the aftermath. At the time of publication, the author held no positions in any of the stocks mentioned.This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.