I fully agree with ArtPearl on both points.
My computers are almost never idle, I'm almost always rendering something. If it's not a new image, it's a larger size of an old one, or a new version, or whatever.  If it's not Vue render, I'm doing a Poser cloth simulation (also CPU intensive) or working on other stuff for which I wouldn't like the computer to act sluggish.

Regarding the 2nd point, just some weeks ago, I had a file sent from another member of Renderosity for testing something and I couldn't render it because I lacked a couple of specific trees. I had to manually replace the trees by some others, which gave a completely different look to the scene.

There's also the security issue. I'm not very fond of the idea of opening my computer to the internet, even if only one more port. Generally speaking, the less doors are open, the better it is. One of my computers where I work in Vue is not even connected to the internet at all. It's physically isolated, so that I don't need to worry with firewalls, antivirus, spyware, and the like, and so I have maximum performance with it.

Anyway, you do have some strong obstacles in your way but I still wish you the best of luck. It's a good thing what you are trying to do for the community.