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?
Are you know token that will grow up next night?

Tell me, I`ll buy it.
BTW to your question: this can be when devs are know inside about news or new strategical investor mb, and then they buy all allowed tokens from market and after it price go to the moon.