The new owner should create an account and have it transferred but some people aren't interested in transferring shows between TiVos and don't take this step. I've never sold a TiVo (yet) but past discussions suggest that units you purchased remain on your account in some form (perhaps as inactive devices?) unless you jump through certain hoops to get them completely removed. So, yeah, it's come up before but I couldn't tell you offhand what search terms to use. New owners of secondhand lifetime units only have to have the TiVo call in from their zipcode to transfer it to their account.