Personally I wouldn't invest in any ICO, pure gambling, steady gains with BTC is just fine.
You don't have to invest, you will pretty much be fine with your BTC stash. But the thing is with successful ICO projects you can become even richer, even faster.
There is always a risk involved - but we have to remember that Ethereum, Waves, Augur, Lisk was released as ICO.
Same with The Dao - which was the most successful ICO crowdsale ever with over $168 million USD gathered, but we know what happened later.
tl'dr Want to earn fast buck? Invest in ICO. You want to play safe? Stay and watch, no one is forcing you to put your money on the line.