It is due to the market vokatility. The market value of most ICO tokens are falling upon being listed on exchangers which yields to loss of profit. It is also the reason why investing after the ico is more advisable given that the market value will suddenly fall and there's a tendency for its market value to recover. In such way, investing would still be profitable at times like this. Holding also is really necessary. But being patient is not a simple thing that can be easily done.