What's the advantage of building a $500 system doing 1600hs and then building 60x of them? That's still $30k. When you can get the same hash with just 2x 4xx/5xx cards or 1x vega and still have more slots to lower the system power overhead? Just spend your $30k on modern, faster, more efficient hardware...
Please show me where you can purchase these cards in bulk at a price that is not astronomical as I would love to fill my empty PCIe slots with them. Some of us are on the path of putting whatever iron on the fire that is making money, even if it isn't exactly the most efficient or latest wiz bang contraption. Even better, when / if (

) GPU prices get back to normal, we have tons of open slots ready to accept them with minimal config and downtime. Until then, they at the minimum, more than cover the expense for electricity of the combined GPU/CPU mining activity and earn back their own cost, slowly but surely, even in the depressed market we are in compared to 3 months ago.
-=Slow Growth=-
Someone might see what I did there...

Until then, I snipe cards when and where I can if they are relatively close to what msrp was.