even the IEO can also be a scam. when the team from the project only makes money, they can take advantage of sales that occur in the IEO. well, it's just that I think we can reduce the risk by choosing the IEO based on the market.
I don't really understand what you implied by mentioning about market, but IMO whichever IEOs investors can join and buy easily are risky IEOs. Good, high quality and potential profitable IEOs come from big and reputable exchanges are really really hard to join. If you are small investors, and don't have rights to buy pre-IEOs, you will hardly to buy, even just small amount. In contrast, IEOs from newborn, shitty exchanges are much easier to buy, but extremely risky because they might end with dramatic losses in values. Briefly, the level of easiness when you join IEOs somehow tell you the fact that exchanges behind such IEOs are good or bad.