why do you think that this is an advantage? i do not see it that way, since big pump usually brings some kind of dump after that and then users accusing both, project and exchange for a scam, and in some way that is a scam, since exchange is listing project that has no product, just an idea, and without obligation to spend acquired money on development, usually that are just best wishes, only advantage of IEO compared to ICO is that you have possibility to trade your token when you acknowledge that project is failing, if other do not see that before