If you have answered your own question, and want to start a bounty on it, you must start at 100 rep instead of the default 50, because:
To avoid overly promotional bounties, if you are offering a bounty on a question that you have already posted an answer to, your minimum spend is 100 reputation (not 50).
This is true even if your answer is community wiki and you would earn exactly zero rep from it. This makes no sense. I suggest that the condition be modified to "if you are offering a bounty on a question that you have already posted a non-community-wiki answer to, ..."
True story: I recently asked a question to which I later found an elegant solution buried in the answers to a slightly different question. My question is not a duplicate of one the solution was posted as an answer to, so I have reposted the solution as a community wiki answer and accepted it. In the meantime, another user posted an alternative answer that, while not the solution I would prefer to use in practice, is extremely cool and I want to reward them for it. I don't want to mark it as the accepted answer, but I'd like to give them a bounty of 50 rep instead. I don't see why I should be required to spend 100 rep in these circumstances.
