Nice logic you've got there.
It usually happens when you are not expecting to work well but the rewards are pretty good in return. If you have passion and really love what you are doing, you'll never get tired of it. But with bounties, it's different you'll likely to get tired of it because of too many scams.
Yes you are right, of course that passion comes when their work is considered to have a short term. But now many of them don't know which ultimately leads to fraud.
The job is very motivated if there is no problem, if the problem occurs they will certainly feel disappointed with the work they did turned out to be in vain.
So they have to work with their own research assistance, regardless of what other people say.