Why an ICO ? there is a huge altcoin market with hundreds of coins out there that can bring you equal if not more return than trusting in an unproven ICO.
Don't get me wrong, there will be an ICO that will take off and really work out well, it just seems lately that ICOs have gone crazy, every other announcement in the alternative section is an ICO token.
If I had to suggest an ICO to you I would look at Dimcoin, Tezos is ridiculous with a never ending cap, when it is released it will be difficult for it to reach a decent price, it could almost have a supply like DOGE.
So with 100$, in which cryptocurrencies would you invest in long term to have equal return rather than invest in ICO ?
Ripple, Monero, Litecoin, MaidSafe, Augur, Golem, Skycoin, Siacoin… Some of them have already reached +10* times their initial price. Is it really worth it ?