the 30 days SE suggest is to short, as the other older suggest SE can make it like this:

1. Active service: house relinquish after 60 days.
2. Cancel service/Acc not renew: House relinquish after 10-15 days.
3. Add in limit : 1 personal house and 1 FC house/acc

I do believe this system is fair, it give ppl enough time to travel for holiday and as soon as ppl cancel their acc service, the house will be re-move