You can't predict the price no matter how successful the ico was in past ico was multiplying your funds just by waiting for it to get listed on exchange but now there are various factors affecting the rogue one them is bounty.
It doesn't affect some ico but for more ico they give their tokens for advertising and the amount of tokens are really high at times because of this the price get's dumped whenever it get's listed on a exchange.
Another factor is general opinion if people actually like the feature and idea of the ico it will get pumped otherwise you will have to hold it until a product or prototype is launched.