Barovians are an empty people cursed by fate. People who are born in Barovia are doomed to remain there, even after death. When someone dies in Barovia, their soul wanders the mists for decades until it finds a host.
Most Barovians have no souls, they are empty shells create by Strahd's consciousness. They tend to be compliant, dull and depressed.
Strahd gains no nourishment from soulless Barovians. He hunts only those with souls.