many of those people are watching the price and when it starts going up they will jump on it. this is why it bubbles like crazy. the more people think "crap waited a bit to late better buy now before it goes any higher" the higher it goes. lol. it will all be stopping at the top due to people running out of money, nothing more, so these bubbles often happen when people have excess cash for one reason or another. take a look at your own funds, when is the next time you will have a bump in money (or normally would each year if you are having a bad year, and wont this time, expect others will and plan on selling around that time to get some money, but hold on till then, if you can at all )