If I can't find a bounty project that's already listed and trading I'm done joining bounties.
Sir, if that is your very goal before participating in some projects, needless to say, you are sure bound to not doing anything at all.
Before listing on some reputable exchanges, the owner should made certain that the completed project was successful - should have generated significantly large amounts in terms of total funds raised/received [soft cap/hard cap reached]; some waited for their Beta version already launched; and there’s genuine demand for their token - simply because exchanges charges were exorbitant.
There's just no telling when the ICO we've participated in will be listed on some exchanges or the ICO was a scam, we'll just have to take all the necessary precautions to avoid making irrational or uneducated decisions, and to learn as much as possible about the project. As bounty hunter or investor, that is a risk that we must be willing to take.