Investing in ICOs is the most profitable in cryptocurrency as of now. Because you can buy more valuable tokens at lower price. As token come to the exchange the value will be increased. As You mentioned that investing in ICO is risky. Yes it is risky that is why you are getting so much profit because of investing on them. High risk means high profit. In these days there are so many scam ICOs in the market. You have to be careful and do more research before invest on them