Short selling is a gamble. http://www.investope
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http://www.investopedia.com/university/shorts...lling3.asp
History has shown that, in general, stocks have an upward drift. Over the long run, most stocks appreciate in price. For that matter, even if a company barely improves over the years, inflation should drive its stock price up somewhat. What this means is that shorting is betting against the overall direction of the market.
So, if the direction is generally upward, keeping a short position open for a long period can become very risky.
Losses can be infinite.
When you short sell, your losses can be infinite. A short sale loses when the stock price rises and a stock is (theoretically, at least) not limited in how high it can go. For example, if you short 100 shares at $65 each hoping to make a profit but the shares increase to $90 apiece, you end up losing $2,500. On the other hand, a stock can't go below 0, so your upside is limited. Bottom line: you can lose more than you initially invest, but the best you can earn is a 100% gain if a company goes out of business and the stock loses its entire value.