Probably to avoid having to answer the question CrackerD had. Sort of like the Deli that puts a pound of meat on your sandwich so they won't be accused of being cheap. Meanwhile half the meat gets thrown out along with the longevity of the under-loaded gen. Btw, I keep hearing of the smaller gen being referred to as the "back up" gen. It's not. It's the low load gen and should be used on a regular basis when you don't have your big draws turned on. Motors don't like not being run.