Really glad you brought up this point regarding volume, b/c it's very important. There was another thread discussing this, tried to find it but couldn't. The consensus seemed to be regarding volume that the vast majority of users hold their Steem in Steem Power, but since they control such a small amount of the Steem, the average daily trading volume isn't affected much unless whales are selling or buying. When the whales, who control the vast majority of Steem, are buying/selling are the days we see the volume spiking. Since the whales are so few in number, most days we really don't see much volume.