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.
Both IEO and ICO not profitable today, IEO always have lower price after listing and ICO always delays for listing their coin after ICO sold out, now only trading altcoin or bitcoin and holding both them to get profit, left for investing with IEO and ICO because always dump price after both investment kind listing with exchange market, maybe have other investment kind at the future.