As you know IEO trend is growing but i feel IEO is profitable only for those who invested in token sale but who have purchased altcoin after launched they suffer loss majority of the investors ,as the BTT and some other altcoin examples of IEO.
It depends on the exchange and the project of course. For example IEOs profit of the Binance is more than X5 - X10. But of course if you can join. I tried many times but I didnt achieve to join. My bad chance.