That's because the money flows to the top. There are a handful of Steem-whales holding large amounts of SD and SP who are reaping the benefits of all the newbies tricked into thinking that they, too, can turn a profit. Ultimately they are just going to make money until people wisen up and stop buying into this massive bubble. At that point, they will either sell out, or, disillusioned with past profits, hold on to the rails as the boat sinks, along with all the fish who are wasting time and money on this platform.