usually the presale price is much lower than the listing price. that is one of the benefits of early investors. but once the trading commences, you can never be sure if you can still gain profit based from the price you bought it. because of the dumpers, it can easily go down and you may not even recover your initial investments.
but it depends on the project itself, if the project is strong, they can always go up and recover. just make sure you are investing in a solid project.