As you know most of project's price down after listing and some project price open low and than go up so if you got good price you should sell immediately and if project price open at low than should hold for good price.
That is the common scenario in any ICO projects right now. They are just offering a so called cheap price during the ICO and then after the market listing, the price even drop to a lower price compare to the ICO price and that is when the investors go nuts and start selling their so called investment from that ICO project to get out from that sinking investment.