Its part of the experience as a bounty hunter. In my case, I have not been paid in half of the bounties I joined especially when I was new and joined any campaigns I find. But now im more particular in joining bounties and look deeply to the project and the team running it.
Experience makes us more stronger, here in crypto that is very badly needed and to be more familiar in different aspects to know more about the team behind its ICO. Remember always quitter never be a winner.