The answer to that question may be more complicated than one hopes. In most cases, it is better to participate in an IEO and sell afterward than invest after the IEO. But that doesn't happen all the time. Take a look at Binance Coin and you see what I mean. Bottom line is, one needs to do a complete background check of the product before investing.
Binance coin was one of the successful listings. But there are hundreds of failed listings out there. Theoretically, you can say that investments should be made after proper research. But from what I have seen during my association with cryptocurrency, there is no guarantee of success even if the team is good and the project is 100% perfect. The cryptocurrency market is extremely unpredictable. Shitcoins may get huge spikes, and good ones may fail to get any investment or interest from the whales.
indeed the fact that the crypto market is unexpected, shitcoin can grow big but ends with zeroes and there are also good projects but when in the market they lose investors who trade in the market. although the research has been done, but when it is entered in the market list, then anything can happen and we must be willing to react to it.