Since most ICO projects are in development stage, the price of the tokens we invested has not factor in the value of  completed projects, so in order to reap good gain investors need to hold the tokens for reasonable length of time for the projects to complete and market. I hold long term some tokens backed by promising projects managed by team of experience managers. However if the price of my tokens get exorbitantly high I would sell some of them, and buy back later when the price come down.