Of course to make big profit, Buy low Sell high!
They are more likely to have a bigger profit because of the cheap price they have bought. So do not panic, especially if the market crashes. Let's take this opportunity to buy cheaper ones!
Smart guys are able to earn money even during the fall. But in my mind, it is much more difficult than to wait until the price will rise. Most people just wait, few ones look for something more interesting.
They must buy in the different rate to able catch the chance of the market. It's more difficult rather than buy and then sold your coin when it has gotten the recovery. So far, a lot of people are shorting when market are being plunged.