According to distrowatch com
Mint has as many daily downloads as Slackware + Gentoo + Knoppix combined.
It is the number 3 on the popularity list, right after Ubuntu and Fedora, and ahead of OpenSuse and Debian which are also among the subforums here.
Why have you not yet created a Mint subforum?
While many of the mentioned distros are more for experts and experienced penguins, Mint is definitely for the masses... it finishes the job Ubuntu almost did.
It has the potential to become THE flagship of the community, best poised to send it's light into the darkness of Windoze reality.
Although all the distros for which you have subforums, certainly have merit on a technical basis and great reason to exist, none of them can convert the masses like Mint has the potential to do.
For this reason, the entire community stands to gain if we make it easier for Mint users to get more focused help and information exchange on that distro, so as to keep them on Linux and lose none to going back to Windoze. They will stay, and bring in their friends, bringing attention on the entire community and all distros.