There is no doubt that Advertising through bounty is profitable. I myself buy so many coins and tokens through ICO. Bitcointalk is the best platform most of the people involved in crypt are attached with Bitcointalk. So advertising through Bounty is a good way to approach them.
what if we did't get paid for bounty?
If you didn't get paid from your bounty programs then it is called as scam programs they will run away with the investor money.But you can't do anything if they didn't pay you because you are the one joined on their bounty so you must need to do neceasary research about that projrct before promoting them.