Also in another note we can use more information than just the collection data of the users, since this is a very good game database which includes the Platinum Versions and the "Best of's", Essentials, etc. we know for starters that those games that reach those status are games which had a considerable amount of sales.
I.E.: To become a Platinum release for the PlayStation it was required that a game have over 400,000 total worldwide sales.
So we can automatically set a max score for those since they sold at least 400k units.
For digital releases, they should be excluded, for now, since it's harder to track unless the more popular digital game distribution platforms posses a service that can be queried to know how may copies they sold of a specific game.
Either way, market available games cannot be labeled in a certain rarity (apart from special editions and such) since they are still available on the marked and copies are still be made.
So the rollout of this should be scoped, primarily to the games of systems that are no longer on the market, then integrate with the recent platforms.
(This is just thought process dumping ^^)