If he had just wanted her as a dishscrubber she would have more happily accepted that, knowing the other option. Ideally, she'd never have taken the job and would have stayed abroad in Germany, studying ruins of ancient castles. Here, she wished that the housekeeping was her only duty, but the House Elves took care of that mostly, so really all she had to do was announce guests, arrange accommodations for when he called a meeting or special occasion with his followers and the like. He paid her more than well enough for her duties, but she felt that considering the added emotional component, she ought to have demanded more. She was no stranger to what happened in private between a couple, and it was to be expected of the Dark Lord and his wife.