I don't know, I think your dojo sounds very reasonable George. For many years now I've been paying nearly 2K/mo. to train at my dojo. And the cleaning, maintenance/repairs, heating, electricity, etc. costs are all extra.
I'd say that at least my students pay me respect . . . but I don't like to lie!
(Heck, I'd pay $140/mo. just to sleep on your couch! Mmmmm, comfy!!)