Bounty is not profitable at the moment because most of the project don't achieve soft cap in token sale. Bounty allocation is so little that it can't be equals to transaction fees and withdraw fees in most of the cases.
I even found a hardcap project but they delayed payment for bount hunter. this is terrible for hunters.
they delay up to 3 months, this means they open their tokens in 2019.
I don't understand this situation, it's very bad