I think that you should continue to join. The truth is that just because you did not make any money from joining one ico does not mean that you will not make any money from joining another ico. There are a lot of icos out there that are committed to their project and willing to make sure that the people involved in their ico make the most amount of money.
For me, it's yes because there's a lot of money to earn when participating in ICOs which proved already by so many people world wide and even I also received many times the bounty rewards.