While I agree that that is a huge problem with this site, and many other art sites, but, well, can you imagine the outcry if they implemented a QC setup here?  If people had to submit their site for Quality Control before it made it to the gallery here, there would be an absolute mass freakout.
Also, sorry for using you as an example...but, uh, you started this thread.  The result?  They removed the nude image.  Sketch.  Whatever.  You bitched, they removed it.  While it may not be your "fault", per se, you triggered it, in the end. 

But, you know what the problem is with the community as a whole?  I'm talking the Digital Art Community.  Not just Renderosity. 
Elitism.  Commercialism.  Competition.
I remember, when I joined rendo in 2001, it was after viewing Moyra's Web Jewels (which is now down.  Moyra, incidentally, is a talented artist, working for DAZ, making wonderfully awesome texture creations, mostly for Platinum Club items.), and seeing a link to Renderosity.  I joined.  I pined for the talent.  I tried the trial version of Bryce 5 (I think it was 5..it may have been 4, but I really do think it was 5), and loved it.  Then, I saw human figures.  Saw that Poser was used.  Tried the Trial version of POser 4 and absolutely hated it.  I convinced my brother to help me buy Bryce 5, and I had it within a month of joining here.  I sucked at it, but I was learning.  Then, I found Terragen, which was free, and I didn't suck as badly at, and was encouraged by others to keep up with...which, of course, I didn't.  In all that time, I admit to lurking, trying to learn how to use the programs, trying to find out how to be at least moderately okay at this digital art thing....and seeing so many people helping each other, FOR FREE.  Sharing their knowledge.  For no monetary exchange. 
I didn't really pay attention to community goings on at the time.  I didn't feel I was good enough to "mingle with the pros", so I stuck to my little corner of the world.  I did, however, chime in with help once in a while when I knew of a fix.  It made me feel like I could, one day, be an expert.  Anyway, there was a policy change earlyish on in my membership.  I don't remember what it was.  It may have been when the hardcore erotica was removed from the galleries, and Renderotica was born, but I'm not 100% sure.  Like I said, I didn't really pay attention to goings on. Anyway, there was a mass exodus.  The forums got quieter.  (Those of you who are constantly going on and on about "we're all leaving, and the site is gona die!!" You've never seen anything like it, nor will you. So, you can quit shouting about the 'end of times'.)  But, those who were here for Community...they've stayed.  They're not as active on the forums much lately.  A lot of the questions being asked have been answered over and over.  They're still helping people out. Making awesome freebies.  Writing wonderful tutorials.  Sharing their knowledge.  They are why a lot of people come here day after day.  They are why I decided to volunteer back in 2005 to become a Coordinator (later becoming a Moderator).  I felt that I should give back to the community that gave me so much.  I don't have a great talent for modelling.  (You know the "Space cow" tutorial for Hexagon that comes with Hex 2?  Mine looked more like an art-deco jalapeno-couch.  Yeah.  I'm awesome.  psht)  I'm not the best texture artist in the world (but I'm getting slightly better).  My lack of concentration makes writing tutorials for people without ADD a bad idea.  So, I gave my time.  I'm such an idealist.  I thought things would go better than they did.  At first, they did.  And when things exploded from time to time, I'd take a break and walk away.  But, like I've said before.....the sense of community is gone.  In its' place is the "look at me, look at me" mentality of the galleries, the competition to be the most awesome and have the most comments. 
None of that is the staff's fault.  When lines are crossed that could potentially make the site liable for any actions....when lines are crossed that turn the site into a trash heap...when lines are crossed and people can't have a grown-up discussion without attacking each other....things like this lead to rule changes.  Now, people site-wide are up in arms over this change.  The admin have never stated that nudity is banned from posted images.  It can no longer be included in thumbnails.  I'm sure that, had everyone acted with taste and maybe even some etiquette, this ruling would never have had to be made.  But, you know those pesky humans.  Silly mortals.  Always pushing lines, revolting against authority, making waves.  (I'm not saying always be complacent, but, really, does every breath have to create a revolution?)

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