He’s well aware that from private, specialised potions sales alone -- to say nothing of his patents -- Severus can afford a better home in a better locale. Instead he stays in Cokeworth, a once-dying town now in full death throes, in his unhappy childhood home, brooding. The very idea of it disgusts Marvolo who, while he understands the rage of an unhappy childhood, cannot grasp the level of self-loathing it must take to stay where Severus was once so miserable he begged a Dark Lord for aid in taking care of his source of anguish.