I just cast the 5th vote to close the question Was Cauchy so obstinate?, but the system said that it's impossible to close a question with an open bounty.
It seems to me that this question is primarily about advertising a new preprint of the author, and does not actually have any content. Others had voted to close for not being research level, or for being primarily opinion based. I'm willing to bet the poster put the bounty on the question to prevent it from being closed. Why do we have a system that does not allow questions like this to be closed, once the bounty is placed? Could that be changed?
Others may feel differently about this specific question, so in the interests of not getting off track, let's keep focused on why bounties protect questions from being closed, and not on whether or not this Cauchy question is reasonable.