I have no way of knowing how much they paid for those items though. Can you calculate that for me? Or are we basing this on the actual item value from the item list?
This is based on the item value, not what they paid.
It's not the final word. This system makes it almost impossible to replace high-value items, even with better ones, and still make a profit. I will refine the system more, but for the moment, it suffices.
