Does that imply there is not much of a manufacturing cost difference between 50 kWH and 100 kWH battery pack?
It's either so close that you're overpaying for the 100kWH, or it's not very close in which case you're overpaying for the 50kWH.
Either way: the 50kWH is hit: carrying dead weight on a smaller capacity. A not insignificant weight.