It depends. Some ICO gives big bonus like 100% but they are still good company. One of them is like blockmason which gives 100% bonus. This definitely has raised some concern by the community and that is why the token ICO sale is not progressing fast. However, i am actually very surprised that CEO michael took the extra step to reach out to people and gain their trust so that investors are willing to put in money to invest in them and complete the token sale. So far, blockmason has been delivering their promises.