People likely find it too risky for the price of $3999 that Hashnest is offering for those units. Profitability does look very attractive right now but that will likely change very quickly after Innosilicon and Obelisk start shipping out units and people start mining. It's likely due to these or similar reasons that the STU-U6 is still in stock as well, though that miner mines Dash and is currently priced at $1599 and should be delivered to accounts sometime in July instead of August for the G32.