What do you think about a badge for users having 100% accept rate?
I think that encourages the wrong behavior. I feel pressured to accept answers just to keep my percentage high, even if the questions I asked have no relevant answers. It's too easy of a task to go around accepting a single answer for each question, and encouraging this could lead to wrong or incorrect answers being marked as accepted; which is definitely undesirable.
Regardless of whether or not it's too easy or encourages the right behavior, i don't like it because badges aren't revoked. So if you accept answers to your first three questions and never accept another answer, regardless of how many hundreds of questions you post, the badge starts to look kinda sad.
I think that it not only encourages the wrong behavior as Ian mentioned but that it is highly subjective or variable. I might have a 100% accept rate right now, but once I ask another question that starts getting answers my accept rate will go down. Would I then be awarded the badge mutliple times, each time I hit a 100% accept rate?
In fact, to me it seems that even indicating an accept rate at all is going to encourage people to start accepting answers just to increase their accept rate, which will ultimately have the opposite effect as what is intended. I also think that it is going to cause some people to not answer a question if the poster has a low accept rate.
What we want to reward is the time taken to read all answers and decide if they address the question. If one answer does and is clearly better than the other ones, then accepting an answer is the obvious way to thank the answerer and state that he/she got a relevant answer.
But if no response definitely answer the question, the original poster could still be rewarded in some way for having done the same work as accepting an answer. I even appreciate his/her honesty in not accepting any answer.
I have no suggestion of new feature, I just wanted to point out what we really value behind the "100% accept rate".