Quality bounty projects are rare that's why many bounties gives bad rewards, just because you earned 1k on spreadsheet doesn't mean you will get 1k when trading starts on exchanges, most times it becomes 10$ that is why we must try to promote only quality projects
The reason is that most of the projects are overpriced. In a majority of the cases, they don't even achieve the soft-cap level and therefore all the effort and time put in for promoting the project through bounties goes to waste. And in rare cases where the token eventually gets listed, it loses its value very quickly. By the time the bounty hunters get tokens in their wallets, the exchange rates might have already fallen by 90% or more.