Drive price per GB doesn't even scale monotonically with capacity. Right now, the best price per GB is usually on 1TB or 2TB models. And if you need more than two such devices with SSD performance, you're far outside the bounds of consumer computing and into workstation territory.
It depends on what you mean by "consumer computing", really. The single largest app using up my disk space is Steam, and if I only had a single 1 Tb SSD, it'd be full by now.
