It costs nearly as much to make a 10tb drive as it does to make a 20. HDD's are already pushing far fewer units than they were a decade ago so their focus is on capacity to meet the needs of their biggest customer, the enterprise.
The only way you're going to get cheaper storage at this point is if they cut quality, nand prices fall drastically, or some new cheaper storage medium is discovered and scaled.
It costs nearly as much to make a 10tb drive as it does to make a 20. HDD's are already pushing far fewer units than they were a decade ago so their focus is on capacity to meet the needs of their biggest customer, the enterprise.
The only way you're going to get cheaper storage at this point is if they cut quality, nand prices fall drastically, or some new cheaper storage medium is discovered and scaled.