I do not monitor the Google+ vote count of any one site in particular but I have noticed after voting for a few websites that the vote was removed by Google. So I performed an experiment and asked 10 people to vote for several sites, in very highly lucrative keyword areas and we noticed that those votes were removed within a few days as well. This led me to believe that Google manually regulates which sites can gain or loose votes in some cases. This also makes me think that the votes themselves must have some influence on the rankings for the affected sites (Google says that they DO NOT count for ranking) or why would they care and remove votes manually.
Has anyone here had confirmed (live authentic account) Plus+ votes taken from them?
This also would mean that the system can obviously be gamed by any group that wants to vote up websites. Hmmm, not that anyone here would do that.