Bounty hunters, just like most investors are only concerned about the potential ROI (in this case hunters invest time and resources), and they are little bothered about the project, if the allocation is good and there's hype they go for it.
Also ICOs are very complicated, and it's almost impossible to predict which project would be good.
But you can see signs of which would not be.
very rear to see a good paying signature accepting the low members.
A good signature campaign, for example those which day in BTC are not ICOs, but establishments which has a project and could run unlimitedly.
And yes, they have limited participants and rarely accept Jr members, some take only as high as Sr members.