Sometimes I find an answer which is so incredibly helpful or beautiful that I would not mind voting double, triple or more at the cost of reputation, sort of like a bounty for existing answers. - Does anyone recognize this?
sort of like a bounty for existing answers
But ... that's exactly one of the dedicated purposes for bounties:
An additional benefit is that a bounty bumps the question to the homepage, and it gets featured, so you might inspire more users to vote for the answer.