Investors are always adjusting investments. It's prudent to take some off the table when it goes too far too fast, thus overbought. I took 25% off the table when gold got close to 1400, and put some back on when it got close to it's support at about 1330. I buy and sell GLD call and put options, based on the technicals of the market. I also protect myself with out of the money put options in the futures market. You can't expect people to not take some off the table with a double in 2 years.