How did you come with the conclusion that Bitcoin is a scam just because of 1000 addresses own 85% of Bitcoin? do you understand the meaning of scam? A scam is a fraudulent scheme performed by a dishonest individual, group, or company in an attempt obtain money or something else of value http://www.businessdictionary.com/definition/scam.html meaning that Bitcoin is not since no one owns or operating what it should do because it is decentralized. So now can you explain how can Bitcoin be able to scam people if there is no single person or company that owns it? Lets say that this stats are true, but numbers of addresses that holds huge amount of Bitcoin is not enough basis to say it is a scam.