IEOs are good for secure profit. There is no scan change as they are listing at exchanges after completion of IEO process.
It is good only for those who are able to avail the projects private sales and dump the moment it is listed on an exchange. Sad thought though, the next buyers always bear the losses.
I entered various IEOs and sold all IEO coins with profit.
There is only a risk that for some IEO you should hold the coin of exchange and the price of this coin can decrease or increase.
Good for you but I feel pity to those who were victimized by these IEO scheme.