I am still doing it, if the team requires to add more bounty campaign in the post-ico, then I would love to participate. Because they have proven so far that they are legit and they are complying on their promises.
Of course its very advantageous because you can continue to earn rewards despite the ICO completion. However, if I'm a bounty hunter, I will just go and move on another ICO to promote. One advantage though is that you won't get bored or burned promoting the same ICO all over again.
And what if the token price goes down? And despite the hard work you've done, chances are it will be worth nothing if it the price continues to plummet. So I wouldn't take the risk, I will go and open my doors to another ICO's to promote.