How do you know the exchange price after ICO?
For example Qtum. At first the price was 0,35$, Later it was $6,-
It only depends on the hype and speculation around the coin after launch. hard to predict but usually the bigger ICOs end up with higher profits.
You are right hype and speculations during and after ICO is very important for the price and effect directly but other important points are the dev. and the progress of the coin. If the dev. is professional enough and the progress is satisfactory you can also see the rise of the coin's price even before the entrance of the market.
Hype and speculation are things to keep an eye on, but they're not always reliable. Just look at what has happened to BAT. Started off over 3x what the price is now.. And the hype and speculation were huge for this coin. You just never really know. I haven't found a reliable way of predicting ICO coins, so i've just given up on them altogether. I've lost more on them than I have anything else