Yes, basically everything that you do on the site earns steem. As far as investing more that is all still very speculative. If you see the price of steem rising a substantial amount relatively soon it might not be a bad idea to pick up some steem, but steem is now on poliniex so if you want to go the speculative route there is really no need to tie the steem up in steempower or trade it on the market here on the site. I would say that in the long term steem would overtake ethereum but when is still hard to give a timeline. It depends on market makers, media, and adoption rate. It's still a good time to get in no matter what. We all are still early to the party in my view. ​