Exchange-listing a companys "concept" is always going to be risky. Without a minimum viable product (MVP) being available, then "early" ICO's are really difficult to value after the initial hype/euphoria/promotion of the "concept".
Exchange-listing too soon also has those people that get free (or very cheap) tokens sell them off as fast as they can and move on to the next free play. Nothing wrong with this strategy for the seller but, for the ICO company, it will cause downward pressure on their token-price/market-value.
My view is to limit my investments in ICO's that have a significant lock-up period for managements' tokens post-ICO, as this will certainly reduce downward price pressure in the near term.