I was just looking over some of my old questions from a long time ago. I wasn't sure if I was able to change answers on old questions (I know you can't change votes, after a grace period). To test, I simply unselected and reselected the answer I had chosen.
This doesn't change my total reputation, but DOES assign +2 to my rep for today. Surely this is a bug, no?
If I had 100 questions, I could easily rack up 200 rep to gain the Mortarboard badge (if I didn't already have it) by simply unselecting and reselecting answers. Heck, if I were dedicated enough, I could do this every day to get the Epic and Legendary badges. Imagine-- getting those badges with a total rep of only 200?
Am I missing something here?