Good man! If I had some spare SP I'd do that too (I'm loaning my spare to Utopian.io). I figured David is generally too busy producing his show to do too much browsing of the platform and voting but at least voting on comments on your own posts is a nice way to encourage engagement. Early on when I started with Steemit I made a couple of comments on some popular posts can earned about $100 STEEM and a lot of repututation from them. It was a great leg up thanks to those voters.