It's because they're not native to our plane. There's a bunch of different planes of existence where I'm from, and it's tough to cross between them unless you're working with powerful magic or you can find a natural crossover point, and those are rare.

["Annoying" is maybe putting it lightly. Demons aren't something to mess with under any circumstances, but for someone experienced like him, a lot of demons have lost their "wow" factor.]

A lot of them are just your average nasty monsters, like the shit that comes through the Door each month. All demons just want destruction and chaos, but the mindless ones are easy enough to outsmart.