This question already has an answer here:
I added a bounty on this question. No one was able to answer the question correctly and also there was no answer with votes 2 or more. In such a case the bounty is not awarded to anyone and is not added in my account.
If I want answer of this question and add bounty again do I need to again spend a reputation?
Is this by design that in that case the reputation will simply vanish, can't the user reuse the same for adding bounty on that question later or on other question?