I like that "promotion" idea.

I've been on steem for almost a year now. As a new user I wouldn't have paid for any kind of subscription to SteemWorld but as a steemian I might now because
I have SteemWorld open in a tab 100% of the time when I'm on steemit.

I have you on an auto vote so I can support you without missing anything.

If you do decide to go with a paid subscription, I recommend giving free month or two to new users. once they see what SteemWorld is all about they wont want to steem without it.