Eugine's primary karma engine was karma-mining the Rationalist Quotes page

Nah. The quotes make up <1/5th of his top-ranked comments, and you can see for yourself: load http://www.ibiblio.org/weidai/lesswrong_user.php?u=Eugine_Nier , wait for it to fetch all his comments, "sort by: points", "hide parents", copy-paste down to, say, his comments with +9 karma, and then look at the composition:

$ xclip -o | fgrep -e 'In response to' | fgrep -i -e 'quote' | wc --lines
20
$ xclip -o | fgrep -e 'In response to' | wc --lines
108

Of his comments ranked >= 9 points, 20/108 or <1/5 were on rationality quote pages. I suppose he could be getting much more karma from masses of lower-ranked comments on quotes pages, but that seems a bit unlikely and more work than I want to do at the moment.