Bitmain need to push something stronger then 180Gh units to the market, very soon or they will be left behind.
Bitmain: Got anything up your sleeves? No need to worry about future 180Gh sales, they won´t sell less just because you tell us your next move,
Who cares about the X GH/s amount. It's irrelevant.
Hashes per Joule? Relevant.
Hashes per BTC? Very relevant.
Hashes per cubic meter? Relevant for some.
Hashes per second per device? Almost totally irrelevant.
I think Bitmain has done well in offering a device smaller than some of the preorder unicorns. There are certainly people who bought only one or two units who wouldn't have bought a 4x performing unit at 4x the price because they didn't want to dive that deep in... doubly so when the prices are not attractive enough that a healthy profit can be completely assured.
I don't know anything about Bitmain's per unit order processing and shipping overheads, but assuming that they aren't enormous I'd imagine that around $1k to $2k in value is probably a purchasing sweet spot in terms of making devices which are accessible to a large number of people without dealing with the trouble of a lot of small purchases. Keeping the per device price around that much value but driving up the hashes per joule and hashes per sec per $ would probably be a good path forward.