Researching an ICO and doing some investigation before buying is a must. Must have a good, unique and solid business model. I think COSS and MTH has a wonderful business model?
COSS = Trading, Ecommerce, market p2p
MTH = Ecommerce plugin, market p2p
If you want to invest in ICOs, look for something with a working product like KICKICO. What are some other ICOs with working products?