Given that Arthur's never tried it before, he can't honestly say he has any concept of how difficult prostitution is. He has made it a philosophy of his to reserve judgement until he has enough information, so he tries not to wonder or assume why Nancy does what she does in the first place. It's an old profession, and it's not as if there's no demand. She's just so young, but Arthur reminds himself it's not his place to decide what's appropriate for her.

"Why did you come out tonight if you knew you were cursed?"