This is an old issue, and most sellers have moved past it. We concluded long ago that there was no reason to believe seller feedback had any significant effect on keyword ranking. Even though the popular consensus landed on this, I felt it would still be worthwhile to look at the data.
So my team and I analyzed 113 popular keywords and key phrases. We looked at the top ten listings on page one for each keyword and drilled down into their seller accounts. We collected the data based on 1130 seller accounts, recording their lifetime seller feedback.