"Being disowned is a massive deal in pureblood families - you’re essentially cut off from your family tree, and family trees really matter for some pureblood families, like the Notts, and the Greengrass’s, and," he inclined his head to Draco, "And the Malfoy’s. It can effect the jobs you can get, cause’ lots of wizards don’t want to work with blood traitors, and lots of wizarding families won’t even consider letting someone who’s been disowned marry into their family, even the half-blood families. One of mum’s cousin’s engagements fell through because their fiancé had been disowned. There’s a real stigma about it - you essentially lose all your family history. Any advantage of being a pureblood is gone like that," Ron snapped his fingers.