User blog comment:JAlbor/Dawnguard: What Everyone Should Know/@comment-98.127.39.121-20120628195216/@comment-1080767-20120629015253

Actually, there's an option (in the Dawnguard, at least) to sell them to Dexion, and he will take two of them for 6000 septims. You will keep the last scroll, and because it is a Quest Item, it doesn't penalize weight capacity.