Im sure they started offering S7s from Batch1 on Hashnest although if i am wrong, someone will no doubt correct me.
I think you are right
Well since that is the case I really hope they roll out the s9 hashes soon so we can all buy those and get a lot lower maintenance fees. I suppose we'll have to pay more for the gh though so maybe in the end it will be the same as an s7 in terms of time to ROI