That's because there's a floor to HDD prices regardless of size. If you want maximum storage per unit of currency spent, you'll be looking at 16-20TB drives wh

That's because there's a floor to HDD prices regardless of size. If you want maximum storage per unit of currency spent, you'll be looking at 16-20TB drives which go for 15-16€ per TB in my area. By comparison, 4TB drives tend to go for 20€+ per TB. But I agree that SSDs have moved much more rapidly and am looking forward to them finally surpassing HDDs on the price front too.