By now I think this a pretty fair question to ask - especially with these new houses (namely the Sanctuary and the princely dawnlight palace presumably on the horizon.)
I really think the housing community and all of the ESO community for that matter deserve to have this information confirmed by now, especially when you take in account the fact that these are only being sold for 3 day periods - I mean really?
Regardless of whether or not you feel ~$150 is a justifiable price for these upper echelon houses, it is CERTAINLY unjustifiable in my mind to do so given the obscurely low furnishing cap of 700, and with no actual confirmed reassurance from ZoS that we will see it in the (hopefully) near future.