You should do a lot of research about ico, check its project, the background and its members. If you think that this project is good and may become successful in the future, then you can continue joining the ico, but this is my opinion, of course the final decision is all in your hands.
It is really important to make a deep research when searching an ICO's to join to, because there are many scam ICO's that make us disappointed in the long run. But to avoid joining scam ICO's we need to check its project objectives and ideas if it is useful to the community and as well as the development team members who are handling the project development if they are all legit in identities, if these all are met then we should continue to participate such ICO's. IMOO.