Most of the scenario from my experience is that whenever the ICO's releases their own tokens on the exchanges mostly if they have some bounty campaigns or airdrops for the hunters the price dumps beyond the pre-ico prices and bonuses cause the majority of them are totally dumpers and short sellers, what is the best deal to buy tokens? it is during the 1st week of the enlistment of tokens you would find some favorable deals given the right coins to choose from cause some of them are just scams coins.