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.
I think it's the same if the project's team do nothing for marketing or the IEO is conducted by a small exchange which has less customers. But at least, IEO will minimilize the fear of not getting listed on exchanges and that's the only advantage from IEO in my opinion 
Anyway, trading will more profitable if you understand how to do that.