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.
The conclusion is this, Both ICO and IEO need investors. so the IEO project also does not guarantee for the future or you can get a return on investment. actually this is just a crowdfunding problem, the difference is very striking between ICO and IEO. Investors prefer to choose IEO because it is guaranteed, or not trapped again by scammers, but this does not guarantee for the future in my opinion.
I totally think that a project that will survive or achieve success will have a new idea and innovation in the public.