I suppose the summary is: he can leave the castle, but is strongest inside it. Or just likes it better there. Or both.
Meh, what's there's to do for him outside? Just loathsome humans. I suppose the slaughters were amusing to him once upon a time, but after hundreds of years even the "embodiment of suffering" might get bored of it. But a man's got to be consistent, especially when you've got style. So he sits on his throne, looking like a badass, sipping blood (or wine) and probably takes a nap or plays Angry Birds until someone storms the throne room.
Either way, the answer to the question is yes.