Rewards

Hi,
We have a new, relatively successful weight loss community.
Recently we created a gamification platform, awarding points for certain behaviors. Posting, commenting, receiving comments etc. It is relatively new. We gave away a scale for the user with the most points a few weeks ago. We did it only once so far. We’re afraid that superusers will be the only ones winning. So we came up with the idea of “redeeming” points from list of prizes. While the actions are laudable, insofar as they speak to the goal of “connecting” in order to get emotional support (the main issue in overeating), we don’t want the essential goals “support” to be co-opted by the desire to “win prizes”.
Any thoughts?
Best regards,
Joey