The bonuses are very reasonable I suppose. Each IEO project will definitely do a different promotion. In order for the coins to be sold 100%, at the end of the IEO they give a big discount. Indeed, if we think this will definitely have a negative impact, the price of the coin will definitely decline, when the investor sells the coin.
But it also depends on the potential of the project. If the project has a developer and a smart team in developing the project. I guess the coin price can return.