They don't want to even contemplate storing a warehouse full of new Z9's. They understand that moving stock is business. They want all sold long before production starts rolling them out and they have estimated a LOT of production.
Most should be "considering" whether they've had Z9's (not "mini") mining since late summer of 2017. I would be surprised if they're manufacturing more Z9's (not "mini"). They did that a LONG time ago [More than likely] FOR THEMSELVES. Why sell everyone money printing machines that they can simply use for themselves? First, they mine for themselves. THEN, once profitability has decreased -OR- threat of a fork appears imminent, begin selling hardware.
That is what this seemingly looks like.
They are either blowing out Z9 Mini to make way for the Z9 (Big) or they have inside knowledge that coins are getting ready to fork.
Either way, it's a gamble.
On the subject of Batch 1 Buyers getting coupons vs a 2nd Z9 Mini in the 2nd batch, I would rather have the 2nd Z9 Mini vs coupons that expire in 30 days.