"But I do question your connection between "junk" on the site and the "lack" of community--have you ever spent 10 minutes on YouTube clicking around? YouTube definitely is a community, the millions and millions and millions of crappy uploads nothwithstanding."
I see a connection. Interesting people (from this sites point of view) have a home allready "elsewhere". Being an active community member here means giving up something other. To do that, there must be a very good reason.
YouTube and other famous communities are simply big (big userbase). Impossible to stop people building "communities" if enough people are around. The day ShareCG has a certain amount of users, the same effect may happen here.
I have had a lot of private discussions about ShareCG with others. Elswhere :)
Most of them said: Good concept, a few rough edges, but we will see. The picture people has build from ShareCG is: Free hosting for freebies funded by ads, maybe a few cents cash-back, but not worth to mention (selling crap on Renderosity is more worthwhile).
Not really a good reason to become a part of a community for people sitting on content yo may looking for. On the other side, in combination with a non existing sign-in verification or other kind of protection, a good reason to attract people with "make-an-easy-dollar-with-crap" in mind. The "good people" has to compete with this kind of users - not very attractive for them.
One fact more: A lot of voices talking about problems with shareCG. From "can't download at all" to "captured a virus/trojan with the download". Bad news spreads faster and more effective than good news.
I for me try to go with a new concept for my content. I think I'm able to create reasonable attractive content with good quality relatively fast. Mostly Poser content - not really sure you like to see this. And yes, I'm interested to use ShareCG as part of my business.
From my point of view ShareCG has a great future. I'm glad that you do what you do. Thanks for that.
(Sorry, english is not my first language)