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?
What happened with the tokens that just jumped over night might not repeat itself in time to come, so you use that factor to make your final investment decision. Before you invest your money in any tokens make sure you have a good knowledge about the tokens that is to say it has future value in time to come.