Custom games vs. Creative Game Modes

Strangely enough, I see a bunch of custom games which are simply people trying to prove their skills, a game of friends vs friends, or a mix of in-between. But rarely I've seen people mixing it up. Other times, my games have filled up because of what I've put for the name, and how it actually works. Like Girl champs vs. Boy champs, or Junglers vs. Supports. These games are fun and goofy, and not many people there are actually a lot of friendly people there.