IEO may be good if you only want quick cash, but I dont think IEO will be good for as a long-term investment since both exchanges and projects just want to create FOMO at the beginning, if one of them change their mind and do not rent Market Maker (this case already happened with Perlin project) the project price will fall at the first time. Instead of investing in IEO, I suggest you should DYOR on already-on-market projects to find the best fit for you as the current price is quite reasonable to accumulate for the next bull run.