When I last priced the equipment it wasn't that bad costwise. In my case though it was only worth it to get rid of the whole "dealing with tire shops" issue. A close friend owns a used car dealership and they bought the mounter and balancer. IIRC...it just needed a 240v line.
I have also lost days waiting for tire shops and alignment...as those are the only 2 things I don't do myself.