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.
A project will bring much profit to its investors not because it went through ICO or IEO. A project can yield profit only when it becomes successful in all its developmental stages set on the road map. This will be facilitated by the expertise of the team, the product and how its able to attract investors etc. IEO and ICO is just a method for undertaking the token sales. However, lots of attentions have shifted to IEO because it is more convenient.
Depend with time when we are investing both IEO and ICO are profitable, but for ICO maybe last two years still the king of crypto investment where can reached profit more than 100% because price after listing raise to higher, but today is time for IEO only listed with big exchange market, like IEO listing with Binance and Kucoin where have higher price after coin could trading on exchange market.