Render Farms are not just a fixed thing. A render farm needs access to all the files used in the render. With a remote render farm, that involves sending all the files to the render computer. Some programs have built in things that make this easy and with others it's a matter of just sending all the files and the scene file with render instructions. Local render farms are a different story. There are internal and external programs for running a local render farm. What I have always found to be easiest is to set up all the assets on a drive that is called the same thing on all the computers in your home network. At that point you can just fire up the program, call up the scene file and start the render or you can use a program that controls a local render farm.

I don't know of any one running a commercial render farm for Daz Studio, I'm guessing it would involve just sending them the scene file along with all the files used in that scene. Basicly the same thing you would need to do if you wanted to go over to a friends house who had Daz and use their computer to render out an image. You might be able to do a wide area network over the internet, where your friends computer or the commercial render farm can access your drive directly. Then you get into security things.....

I'm not sure it would be that much help with still images. I've mostly just seen it implemented for animation. I did an animation last week that was a bit over 100 hours. With 2 computers it would have been a little over 50 hours and with 4 computers it would have been a little over 25 hours. If you have more then one computer at home you can simply set up all your Daz stuff on a networked drive (always liked labeling networked drives starting with Z and going down) and fire us a copy of Studio on that computer, load the scene, start the render and go back to the other computer and work on other stuff.