3

Why does a question still have the:

start a bounty

field lit up, as the question has been marked as answered?

Example:

4

There is a blog post which describes in depth how the bounty system works. In essence, the answer to your question is that

all bounties are completely independent of and unrelated to accepting an answer.

The idea is to get people to have another look at a question if it hasn't had enough attention. Even if the original poster accepted an answer as "good enough".

See also these rules for the rewarding of the bounty from the FAQ:

  • If you do not award your bounty within 7 days (plus the grace period), the highest voted answer created after the bounty started with at least 2 upvotes will be awarded half the bounty amount. If there's no answer meeting that criteria, the bounty is not awarded to anyone.
  • If the bounty was started by the question owner, and the question owner accepts an answer during the bounty period, and the bounty expires without an explicit award – we assume the bounty owner liked the answer they accepted and award it the full bounty amount at the time of bounty expiration.
  • 1
    yet another reason is to reward the existing answer(s) – Sathyajith Bhat Nov 30 '12 at 5:51
  • Has this been a proven concept? Will it not diminish the effect of the bounty itself? – Jacob Jan Tuinstra Nov 30 '12 at 20:11
  • @Sathya only if the answer is marked accepted in the bounty period, being upvoted doesn't count for existing answers. @ Jacob The system has been in place over 2 years, it would likely have been changed if it didn't work. Typically questions with a bounty will attract new answers from bounty hunters, albeit with some who just spam them in the hope they win. – John C Dec 1 '12 at 1:44
  • anyone can start a bounty on an existing question and manually reward a bounty on any answer, even if it was posted prior to the bounty period. We do this on Super User few times. The mechanism John talks about is the auto-bounty allocation. /cc @JacobJanTuinstra – Sathyajith Bhat Dec 1 '12 at 4:49
  • Good point @Sathya, I hadn't seen them used that way before. – John C Dec 3 '12 at 3:28

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