I think it's fine the way it is. Or well...
There are different levels of OT and bullshit-nonsense kind of stuff that gets posted here. There's "OT - What do you think about small displacement motorcycles" and then there's "OT - Here are pictures of my naked GF." Where's the dividing line in that? Some OT stuff would be of interest to a lot of people here who might not check the OT forums. Likewise, if the OT forum ended up being a repository for all the bullshit-nonsense kind of crap that sometimes gets posted here, how does that look to new people? I just think it would be hard to make that kind of distinction. Besides, wouldn't stuff like "Moped Fashion" be considered on topic? You're still gonna get people posting YouTube videos and other random stuff in threads like that, so once again, I don't see how that's going to work.
For the most part, I like the mix of stuff we have going on in the General Forum. I get my daily dose of interwebz nonsense exposure thanks to the off topic stuff that people post, and I learn a lot from some of the off topic stuff that is somewhat more serious. The people who post here aren't just knowledgeable about mopeds; we've got a huge array of knowledge represented here -- cooking, photography, cars, computers, languages, you name it, I would bet money that there is someone who posts here knows a lot about it. I think the off topic posts that cover topics like that add richness to the forum. I guess I'd be afraid that if you separated the moped stuff from the O/T stuff, neither part would be as active, fun, or interesting, and the whole would suffer as a result.
I dunno... I need to think about this some more. Someone tell me why I'm wrong.