Have you done it 3 times already? The reason I ask is because my son was living with me and he was changing back and forth between mine and his without knowing that it could only be done 3 times per year.
I called the MS support number and explained what happend.They fixed it so I could make my console my home console. They also told me to not let it happen again lol. It's all good now.
Yea, you shouldn't have to switch you console anymore than once a year (if you ask me). They prevent you from doing more than 3, because (inevitably) people will take advantage of the service to just "steal" games from the marketplace.