I was interested to jump into the same case study so I bough 3,000 re-tweets once and get retweeted dozen times (the tweet is related to trending news). I immediately get hundreds "genuine retweets" and of course numerous hits to my page.
It's interesting that at that time, lots of 'organic visitors' for high competitive keywords clicked my page and continue viral til the next day.
Those 'organic vistors' slowly disappear once the tweet no longer go viral.
Tried another 6k retweets for another page (the topic is not HOT as the first one and got no single genuine retweet), no single click, not much impact seen.
So my conclusion is, that's really important to get genuine retweets from real people, not just millions fake RTs.
Will buy RTs again for the hot topic once I got balance on fiverr and update the results here.