Actually hubby and I stayed activated together for years. Aas in over 10 years. 1/2 that time we even used the same computer. About a year ago I was deactivated for inactivity. Not sure where he stands.
This is not to say that they don't do it, though. For a time my son was also shopping and living with us. He was deactivated almost immediately, and when he asked they told him that it was because there was already a shopper at that address. Not sure how hubby and I stayed on, but I may have been "grandfathered" in because I've been with them over 15 years.