In my opinion there are three types of tasks in a profitable bounty, namely
1. Signature = Although difficult, this can be a good choice for bounty because it usually has few participants.
2. Translate = The given application is usually quite small, but the translation can give great results because it usually has several participants according to the language needed by the project. So to do this we have to move fast and have a good experience.
3. Content creation = Like articles and videos, although usually followed by many people, this bounty can provide good benefits because we only need to do a short job.