Appending a ? to the URLs you submit to HN is tacky. I am curious about the first time that you resubmitted a URL with a ? for the karma boost. Did you feel crafty or creepy?
I thought it's extremely useful and worth re-sharing and many people here apparently do that. I don't know why would you bring in the concept of Karma boost here, unless you were used to doing such things by yourself. I only feel sorry for you.