You can definitely use sbbuilder to create packages for personal user... sbbuilder simply tries (and does very well) to generate a build script that will build the package for you.
Using a combination of sbbuilder + buildbot for automated builds offers several advantages over contributed binary packages from users. Using the automated builds we can get re-producible results. Because packages are built on a clean environment, we eliminate the possibility of hosting bad packages with un-necessary dependencies. Also, because the build scripts are kept in a version control system, package updates are as simple as changing one line on the build script. One more and I can't emphasize how cool this one is, making a new release of the distro is just a matter of editing a few text files to produce new packages and begin the testing phase.
If you'd like to know how to use the buildbot system, see http://vlcore.vectorlinux.com/buildbot/docs