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.
For profit or loss problems in Ieo / ico we cannot predict it precisely because it depends on how good the project is, but certainly now investors prefer Ieo rather than investing in an Ico, this is caused by many Ico projects that tarnish themselves with a lot of frauds (scammers) that have occurred in recent years, so this has caused investors to begin to lose confidence in ico and start switching to Ieo sales.