You can buy it. As of matter of fact, I also wrote on how to get STEEM without being in STEEMIT. Check my site. That's mainly because of mining. But I am receiving Steem Power from my writings and the comments you, the followers, do in each of them. Re-steemit also helps because it gets to more people. But they were talking about an additional tab to do share instead of re-steemit. There is also a "bot" that helps you do Upvote, but that's a different page and as far as I know, they were going to charge for that, starting in January.