One of the things I know up till now is that most of the projects that carry out the IEO on an exchange, 90% of the tokens or coins from the project will be directly listed in the that exchange. Liquidity and security issues are also one of the factors considered by investors.
The bad side.
The possibility for manipulation still exists as long as transparency is not really implemented.
That will be the case for most IEOs why? Its because the whole process is centralized we cannot see the real score even the sales on the IEOs. Though they are saying that they completed some rounds but in reality who can confirm this? Only the exchangw but they cant show the transactions made during the sales or maybe there is no real transactions. Sound fishy but its true.