On more than one occasion, I have had my attention drawn to a question because of an existing bounty and decided to add an answer, even though I know my answer should not be awarded a bounty. Do I need to indicate in such cases that I know the bounty should not go to me? If so, what is the best way of going about this?
(More specific details: In one case, the bounty was designated for an existing exemplary answer. In another case, someone else had added a bounty to an older "showcase" question of mine. I took the bounty as a sign that an additional, more thoroughly explained answer would be appreciated; however, I did not believe I ought to receive a bounty for answering my own question in this case.)