IEO same as ICO for me no different, projects in IEO can mak also loss money, most of us think IEO is the best way to invest and i think the best way to invest by trading or hold BTC
You can do research before you invest, if you want to get profit only in the short term, I think all altcoin after being registered in the exchange then they open the trade, the price will go down, but if you participate in IEO for investment, then you will wait until you get return of investment from the funds that you have spent