Even tough anything could be possible and we could all be a part of a big scam, but I doubt that and your statements aren't very accurate.
First of all, the difficulty of mining the early Bitcoin was very low and since Bitcoin had pretty much no value for some time, mining was rewarded with bigger rewards and that's when the most of the Bitcoins were mined. Nobody could have knew that they would make huge money if they holded their mined Bitcoins, so most of those Bitcoins aren't in their miners wallets for a long time now.
Ahahaha you just put concrete to my statement, difficulty is another argument how easy was in first 2-3 years to mine 10mil bitcoins by small groups of people, when nobody knew about mining, only in 2012 people waked up and starting to mine. By that time, half of bitcoins where already mined, imagine what will happen if they decide today to sell 3mil bitcoin, where the price will go? And still they have another 7-8 milions of bitcoin mined for free almost.