I think there should be a badge for those that have authored over a certain amount of accepted answers.
First off: yes, that is a nice idea and I like it. But also consider that as of now, +15 is given for each accepted answer.
This has also been suggested on The Meta, with very little conclusive results. Although it does appear that badges are a constantly-changing thing, so I wouldn't say it'll never happen. We'll just have to wait and see...
[for more exposure, consider posting this question on The Meta]