That's only one V-Ray post, not "many" :)
As for "ranking" I don't think that's necessary - those who are posting can judge for themselves if it goes in the Gallery, the WIP, or the Learner's Corner. Ultimately, there is a "ranking" system in that only the best get shared on our Facebook. And of course there is the Gallery on the website, which is curated (users have to submit, it has to pass in terms of quality - but being curated means it takes time to get updated, and sometimes that can be a long time as things are busy - one good reason why we don't want to start curating the forum too; but mostly, we don't want to be the arbiters of taste of quality when it comes to the forum gallery, that we keep for our official social media and website).
EDIT - and that one V-Ray post is no more, at that. Nothing against V-Ray, but the Gallery here is for Corona renders only :)