Bounty hunters make good money precisely because few people do it. I think if all the unemployed became bounty hunters, the bounty fee would be very low.
It is already low right now. It is almost not worth it anymore, there is maybe a few bounties worth it. I dont remember when was the last time i got something meaningful out of a bounty campaign.
Bounty hunting and investing can make one rich within a set time. However, I wouldn't advise you take it as a job permanently. It doesn't pay always and it has got it own risk.