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.
indeed if we understand the concept of various ico or ieo is the profit that can be obtained if we invest in the beginning or pre-sale. it aims to help the project get a lot of funds and be successful until launch. then after the launch occurs, profits are indeed difficult to obtain for investors or traders because tokens will be difficult to compete after launching. although there are also some that can last a long time, but for ico or ieo, it's better if we invest in the beginning or pre-sale.