I bring some new people in and have them do a few posts. Then I upvote and show them how much money they can make even if it's just a few dollars. Then after sometime I help em out to show them they can actually convert it into BTC then to cash . Usually I send em over to Poloniex then to Airbitz where they can sell the bitcoin and have the cash deposited directly into their bank.

After that, then they are pretty much believers. Also, just mention that all that time posting on Twitter/Facebook etc. is better being spent over here to make some $$ than giving out your content for nothing.