If you know the trends 90% of the ICOs when listed on the exchange their token values goes down within a week about 30% to 90% from its ICO price. So its better to sale token initially & buyback later if you think project have potential & can give you profit on longer run. In this way you can multiply your holdings & have more token in your pockets. You can see the ICO ROI Status here https://icodrops.com/ico-stats/