Some bounties still profitable as much as they pay their participants - but I don't think bounty participants can expect a large payout after the bounty ends. Projects can change payment plans unilaterally if their project is successful - it happens in some cases.
They always treated hunters as begger this days, some campaign budget will be very small and the will required for a lot of Paticipate to carry out the campaign, sometimes the project manager will scam the hunter by distribution of fake coin. Even though their project is successful they still decide not to pay the hunter.