The capacitor doesn't itself significantly increase the price but there are more differences than just a capacitor in the datacenter drives. Look at the power c

The capacitor doesn't itself significantly increase the price but there are more differences than just a capacitor in the datacenter drives. Look at the power consumption for the start, DC ones use much more power on idle. Also look at the technology behind: DC variants have to be more conservative with the stress to the cells (less bits per cell, potentially less cells per area, potentially more spare cells to replace died ones etc). And the market segmentation is the natural way to go. The different needs and different sensitivity to price determine the price.