There are some questions like this one:
How to find out where a macro is defined?
where a bounty is offered to an answer that is not upvoted a lot and not the accepted answer. The bounty is offered for a different reason than awarding the answer to that question.
It could be that future users mistake the bounty as "hey, this answer must be the correct answer, as it has such a high bounty".
What do you think?