I noticed this phenomenon. Often someone buys up all the proposed tokens with a small amount of trading (for example, look at SMT on hitbtc this night), and after a few days these tokens go up in price very much. Is it worth buying such a token?
That's the process of collecting sharks, if you understand how to analyze the technique you might realize it. And swimming with sharks you will earn a lot of money.
But it's not so easy as you said, basically, the pump will not be so long or a day after pump it will be back again and you should understand if there were some kinds of manipulations and created pump and dump was including one of the manipulations that created by the whale.