Just as much as we have seen a lot of them succeeded, does not mean it is a totally scam free means of token sale or marketing. Why because, there are some newly lunched exchanges, that have not spent so much time in the crypto space, yet are aspiring and already making moves to conduct IEO.
If you seriously desire to take part in IEO, which is a good move, either as a newbie and as an expert in trading and investment, limit yourself to exchanges that you trust, most especially those you have been using right from time or the top exchanges in the crypto space.
This is not an investment advise, but a warning to safeguard your assets.
Yes, we should participating in IEO that launched by credible exchanges, considering there are many scams in crypto sphere.
New exchange should not holding IEO just because they want to rise their exchange public awareness.
First they need to build user's trust on their exchange, so many traders and investors using it.