I keep a close watch on different ICOs and try to buy them when they are not yet listed on trading sites so I buy them at very cheaper rates and sell when I see higher price on sites once they are listed as its the most easy way to make profits.
But investing in ico also involves a huge risk as I have seen in the past that when coins get listed on sites they simply disappear in a single day and only the owners make profits from that and majority of investors are sitting on loosing end.
It depends in ICO ,it is a risk everything is you are responsible for the investments that you made .As far as i know more ICO now and coins are going in good progress of price after releasing and available to trade . I suggest before to invest make sure you have research on it ,how a coin will succeed based on the projects of it.