its a fun game, and it promotes peoples blogs. A win for all people all around. I don't know if you have run across it yet or not, but @thedarkhorse runs a weekly contest called Pay it Forward, where people pick 3 new users, do a little profile and leave a link to their page. Week 4 should be starting in 3 days or so. I hope I can remember and enter you then. It may be something you might be interested in also, since it is a challenge to get people involved in helping each other, kind of like your contest do.
RE: Steemit Bingo Game #3 Winner(s) Announced