I have a few questions for which I have offered a bounty; sometimes several times. In most cases, I have done this a few times because the questions have received no answers - sometimes, no comments either.
It is hard for me to gauge the reason, sometimes. I don't know if the question is a "stumper", it's not phrased well, or no one is really interested in the topic.
Are there any suggestions as to how many times someone should offer a bounty as well as how frequently it should be done?