I have thought about this some more, and what I am trying to say is coming out clumsily. Which is an indication that I am unsure of what, exactly, I am trying to say.
I think it comes down to this, though: there are good, serious, struggling artists all over the place. Some of them I would surely judge as "crap" and a few I would judge as "good" but that is beside the point.
When those artists are spread out thin, as in Duluth, Bellingham, or Toronto, they don't really know one another socially. If you reach out into a pool of friends, even if you are yourself creative, and know a bunch of creatives, you're unlikely to stumble across one of these people.
I hypothesize, but do not know for sure of course, that in that very small number of cities to which creative types move/flee in their 20s, the density of genuinely good, talented, creatives is high enough that simply asking around has some reasonable chance at turning up someone worth talking to, worth showing.
I am biased, of course, because I don't use the "asking around' method, instead I wade through mountains of stuff I find on the internet and in various and sundry printed materials, following leads, following my nose, and occasionally I stumble across someone I like. This is radically different from reaching out into my social network, asking "hey, do you know any good photographers?" I happen to be certain that the latter method would produce endless birds-in-flight, colorful landscapes, and other insanely boring derivative, albeit well-executed, photographs.
Perhaps it is a foolish pipe dream, that If Only I lived in NYC and was young, and beautiful, I would know people who knew the really good rising artists. I am not in NYC, I am neither young, nor beautiful, so I don't actually know for sure.