I was not suggesting a solution. It seems to be working as intended. I left Wikipedia pinned, as now, it seems obvious that this presents pinned results first independent of the quality of the match.
After some playing around. It appears that "pinning" just reorders the results on the page. For instance, if there is a Wikipedia match that would appear on a subsequent page it is not returned without searching for those later results. Some criteria could be added beyond "the result appears on the page" to determine if it is pin worthy, but then I would just be here filing bugs about how a site appears on the results page but it is not pinned.