Except Bitmain has announced and will be shipping to preorders the first Equihash ASIC (Antminer z9) in July... only 3000 z9's would be needed to equal 30 Megahash, which would be $6M at the z9's $2k price tag. Bitmain obviously has been mining themselves with the z9's for a while, so I would bet that they noticed this and jumped on it before shipping their "lightly used" units out.