ICO is a super unpredictable investment that you can make in your life. and usually you will come to regret it. I say it is unpredictable because you never know , a coin can become super successful if the dev is good and the hype is great and the price can keep on rising even after the release but also it can die so fast which is the common thing happening with most coins and you lose money even after the release.
Well i don't have much experience about ICOs as i have never been investing much in them but i recently invested some satoshis to a ICO of a coin released recently its name is WAY, and that actually grew some percent after the ICO got finished, i actually did not invest much as i was just trying it but the people invested big must have earned good profits through it.