If you haven't noticed, BITMAIN adjusted its pricing for batch 3 S7's in relation to the time before block halving more than the difficulty. Batch 3 S7's are at $1,658 instead of $1,823. Each month that passes by before the block halving apparently is affecting the price of their rigs with the price of bitcoin virtually unchanged.
So, if Spondooliestech does not want to miss the boat for selling the SP50 with optimal returns, they might want to have them up for sell relatively soon.
It will be interesting to see how the block halving affects the pricing of rigs [If at all] as it approaches.
Read btcs news from sept 28. They had to lease their own (SPT) equipment. I am not sure about the rationale for it.
eventually, they will probably have to either borrow money or do a preorder to start producing these units in bulk.
I don't think they plan to produce them in "bulk". They are only selling to specific customers, I'm guessing they may build to order based on the demand from the customers they plan to sell to. Or at least it will be a limited build quantity based on their projected sales. I don't think they plan to have a large stock of these units sitting around for the reasons surrounding the upcoming halving.