I was never a youkai who preyed on humans directly anyway, so co-existence is fairly easy for me. All I want are what you too generally consider the good things in life.

[So booze, smokes, good food, willing partners, some gambling ventures for entertainment, maybe a little respect.... Give him those bare necessities and maybe a place to call home that's big enough for one + a spare room for potential guests, and he'll be happy. Which is quite a jump from the overly grand ambitions Douman had held as a youth, and even further removed from what other peoples would have expected of such a "notorious" villain such as him.]

Do you have any hunch of what those criteria might be? My own guess right now is "either simply convenient or tasty for the one casting the net", but I might be thinking in too inhuman terms.