I Need to Vent About Reviews: The ones that are supect

As an indie author I cannot fathom how a book released on March 24, 2015 gets 8 five star reviews by 8am on March 24, 2015. It is possible and plausible though. I imagine with   ARC’s and other tactics. I cannot however figure what tactic that is legitimate and realistic causes a book released that day to have 123 five star reviews by 8am that same day. Something doesn’t seem right. I have run all the permutations through my mind and cannot come up with one laudable way that this can be done. It seems to me the only way to do this is nefarious. Maybe this is because I am at the dawn of my writing career and something will reveal itself to me once I pass some milestone and learn a secret author handshake. I won’t hold my breath though. Can anyone think of a way to get 123 reviews in 8 hours for a 400+ page book? To get that many I figure about 1200 people on average would have to read it and 10% took the time to review it. That is at least 123 and as many as 1200 people reading a 400+ page book in the eight hours after its release, and they all liked it enough to give it 5 stars. Does anyone else see a problem here?