Medals will have a third rank, after gold, that gives a certain amount of premium, maybe like 1 week or so. Like the ranks for medals will be bronze, silver, gold, and then platinum, the platinum medal giving you a free week of premium. (I'm not sure about the week duration, maybe less, maybe more, I'm looking for input

Specifics:
I said most of it in the description, but basically medals will give members 'free' premium for a short period of time. (i say 'free' because they still would have to work for the medal in order to get it.)
This will improve the following aspects of the site:
Because there are many members of this site that aren't premium, and will never think about becoming premium, because they don't think its worth it. If medals gave them a little taste of what premium is like, they have a better probability of spending money on the site for premium. For already premium members, it would give them a little more time to enjoy the site they love before renewing their premium, and it would be a nice reward for being good at the games.