on Bitmain.com the actual manufacturer of the mining rig you show the price for the antminer L3+ 504MH/s and the APW3++ power adapter is under $2200.

Why would I pay $4000 for one from China? Depending on the state for those in the U.S., 1000kWh/mo is roughly $100 extra on electricity.

The mining rig can mine LTC instead, which is faster to mine at a fraction of bitcoin but still, 1-3 coins possible a month versus 1 coin a year begs for some practicality