Are bountyhunters really making good money?
The golden days of bounty hunting are gone. At least for now.
This doesn't mean there are no people willing to participate, the problem is that ICO/IEO/whatever don't get investments, so the number of good new bounties is small. (And too many scam bounties also pollute the "market".)
Also I am not convinced that your approach / your websites are in the right direction. I would certainly not create an user to join to bounties when I can search here in the services area.
Do your sites do more? Do you (properly) check for the projects to make sure they will pay? Do you enforce the bounties escrow the funds? Do you enforce the bounties pay in something else than (useless) tokens?
Maybe the honest answers to these questions could improve your sites/services and make bounties better for everybody, since sooner or later better days should come (probably after Bitcoin rises more though).