Oh, one more thing: if your only motivation is cost, you might not want to do it yourself, unless you are very efficient with using your chemicals. You can achieve much lower costs than a lab, but it does assume you aren't throwing away unused chemistry (like working solution that has expired before you got to use it), and the jobo numbers assume you are using jobo volumes of chemistry. Those volumes are the minimums required to get full film coverage, but may not be sufficient to provide adequate chemical processing for the amount of film in the drum (the square footage of film).
I think your motivation for home film processing should be based on your enhanced ability to control the process (you get to decide how much to push/pull, and you get to decide what chemistry to use, including brewing your own). Also, doing it yourself means you get the film back faster than the typical lab can return it.
Oh, and as a bonus you can do your prints in the same machine (not at the same time of course!).
But you probably won't match the lab's fiscal efficiency unless you do careful planning.