There are too many ICOs launching nowadays. This is due to popularity of ICOs. However you need to be careful while investing in ICO. The simple reason behind so much excitement of people in ICOs is due to the large and tremendous gains many ICOs gave to their investors in the past. A huge unimaginable percentage of return are provided by some ICOs in the past. That's why people believe that some ICOs will give high returns in future also. Some ICOs that have strong team and great projects may give high returns but one need to be careful while choose a good ICO. You need to check various things while investing in ICO such as whether a working product is there or not. Also project behind ICO should have strong team. Website should have all the details. Whitepaper must explain everything. Roadmap should be clear. Also future usage of ICO tokens must be analysed. I try to make sure it is not just ripped off from another project and the concept is original.