To quote Asaf Karagila
What a terrible terrible ... terrible terrible idea.
(I might have opted for "awful" instead, to squeeze a couple more in there, but the sentiment is the same.)
If you want to pay people to answer your questions, there are already sites which provide this service. So what benefits would it have here?
None that I can see.
When you post a bounty on a question, this is in fact listed as one of the options for why you are putting a bounty on the question:
Reward existing answer:
One or more of the answers is exemplary and worthy of an additional bounty.
I am ambivalent on the badge idea. I am among those who already find sufficient motivation to offer bounties, and I don't know what positive or negative effects such a badge might have. Here is a related thread on meta.stackexchange.com:
Badge for bounties offered?
If the answer is of very low quality, flag it as such. Other users will review this flag, and if necessary, the moderators will intervene.
If you see a pattern of this behaviour in some users, or if you suspect foul play, please flag this as "in need of moderator attention" and explain the situation.
Your question was asked on the 20th of November. Five days is by no means a long time for a question to go unanswered.
Unless of course you are in hurry to obtain the answer, because this is question 9 from MIT PRIMES-USA, and ongoing competition whose deadline is November 26th.
The second option. You should not change the question in a major way, especially when you have answers. This is true even for old questions, like this one.
If you want to ask a new (related) question, then you should ask it in a new post and link back to the original.
Perhaps you didn't know, but you can award bounties to others' questions, too. (You can even get badges for this: Investor and Altruist (both bronze).)
In fact, one of the reasons one can give for instating a bounty is "Reward existing answer: One or more of the existing answers is exemplary and worthy of an additional bounty":
(Of course, the points ...
I don't believe it is too short. Well, actually one of my bounties just ran through the week without someone writing an answer to it.
In my opinion making the bounties lasting longer there will be (at least I expect it) much more questions in the featured tab, which makes it less attractive for someone to offer a bounty, because there will be less extra ...
The privileges are tied to reputation, so if you offer a bounty and your reputation drops below a privilege threshold as a consequence, you lose the respective privilege until your reputation again rises above the threshold.
So if you offer a $50$-point bounty before you have at least $100$ reputation, you lose the "comment everywhere" privilege until your ...
Yes, there is an automatic process that will take care of the bounty if you do not award it yourself. From the help-center:
If you do not award your bounty within 7 days (plus the grace period), the highest voted answer created after the bounty started with a minimum score of 2 will be awarded half the bounty amount (or the full amount, if the answer is ...
Unfortunately, there is very little that can be done about a bounty setter who has abandoned their bounty. Note that the bounty setter is notified via the site notification system, and email, if possible, that their bounty is about to expire. Beyond that there is a fail-safe, of sorts.
First, the bounty period does not end at the end of the bounty period (...
One problem is that there are no reputation points on meta, thus it is not clear which points should be used "to pay" the bounty, and even more where the answerer should gain them. (For the first one might say, just use the points from main, but for the latter this is not really a good idea, to give points on main, for meta content.)
Furthermore, the volume ...
I don't think bounty rules will be changed any time soon, but I don't think that's really a problem:
You can just post a comment saying that you offer N rep bounty for answer to this question (and after question gets a useful answer you can technically start a bounty and quickly award it).
...And you can keep a question in featured tab for one month paying ...
I would not want such things to occur too much. If all posts had such a bounty, it would turn into chaos. But I don't think anything is wrong if you do this on occasion. I don't want to say that all must act grim and unhumorous to do math.
Did this particular bounty bring about a solution with no flaws? Probably not. But did it hurt anything? Not in my ...
There can hardly be any good reason to change a question-post into something completely different, rather than to post a new question. If there is a bounty on the post it makes the situation even worse.
In such a situation one can and should do at least one of the two:
Flag for moderator attention (flag "other") and explain the situation. A moderator can ...
The bounty reasons are the same throughout the network. This bounty reason is easy to understand on sites like Stack Overflow: Releases of new versions of a software package can make answers referring to an earlier release outdated, that's not an uncommon occurrence.
An analogous thing can happen in mathematics, a conjecture can be proven/disproven, ...
This is an unusual situation. The main problem is the repost of the question by the asker. This is not admissible. Somehow this went unnoticed. That they then got both bounties is an astonishing twist.
Generally it is inappropriate to answer the exact same question twice rather than to mark it as a duplicate. That said, in this unusual case from the ...
In terms of reputation, one way to minimise the difference between the two answers is to upvote and accept the answer (by ticking it) you think is the most clear and of higher quality. This would gain them +25 rep. For the other answer, you can upvote too and provide the bounty of +50. This would gain them +60 rep; the difference is only 35 rep.
As @Mars had ...
Q: Do I get the reputation back when question I placed bounty that was already awarded is being deleted?
A: Yes. The change is not immediate like other reputation changes but the reputation points are given back. Source - marked status-bydesign is official enough. If the question is undeleted, the reputation is reduced again.
From How does the bounty system ...
That can certainly be frustrating, and is a risk any time you offer a bounty. I don't know what your background is, but please note that MathOverflow is intended primarily for professional mathematicians and graduate students doing cutting-edge research. A sufficiently interesting question from outside that community will sometimes get a useful answer, but ...
No, you do not get the bounty back if no answer is given. In fact this is mentioned in the post you link to (my emphasis).
What happens if there's no answer after the bounty period?
If after the end of the bounty period a question has no answers, no bounty will be awarded and the question will no longer be featured.
Bounties are best understood as ...