About reinvest in the platform--steemit. Like you said there are takers and givers. The takers make up to 90% of the steemit population and most of these people are from third-world countries. We know, economically, that there are low incentives for low-income earners to save/invest. It's really hard for a person earning an average of 1steem per post to power up. This is the reason why you have many cases of people withdraw or powering down. Personally I have been on steemit for a month and have earned less than $20. Most of my earning go into the purchase of data for my phone, i have little or nothing to reinvest in the platform even though i want to. There are many like me and this is a burden to the remaining 10%, the giver. I think we should talk more about people bringing in more than their time and quality posts. Instead of selling steem people should be encouraged to buy. But like i said its going to be difficult given that 90% of steemian do not have the funds to invest.
About promoting steemit. I see a lot of people writing about steemit on steemit and I wonder: 'how is this going to bring new people in?' of course we have the share button but I bet you just a few persons use it. If you check on twitter there are less than a thousand tweets with the steemit hashtag daily. So, the point I'm trying to make is that we cannot grow this way, living in a closed system. We need to attracted other users from other social networks.