Its funny. On this article, the google ad beneath it:
"12TB High-End NAS $2999".
Yeah, I mean, come on. 16TB is tricky because you need either two 8 channel RAID cards that can work together, or a single 16 channel card. That's expensive. The 16 drives themselves would be about $1600. But the 4TB is cheap as hell. I can run a 4TB RAID5 array for $500 (5x1TB drives) + $330 (HighPoint 4320 PCI-e 8channel RAID5 card with Intel IOP).
The thing I found extremely idiotic is why to quadruple the capacity is only an increase of 43% in the price department.
Oh, and the Price / GB is not 67c. Its $1.71/GB for the 4TB and $0.61 for the 16TB.