It's not bannable. I can confirm this with my FC situation.

We wanted a large. We actually struck a good deal with someone to get their plot. We had to call a GM because two people were camping the plot to try and steal it from us the second it gets free. GM did come to help with situation, but the guys grew bored of waiting and left already. We clearly stated in the ticket we were buying the house from another, yet no punish and no warning. Hell, the GM took screenshots with us in front of our new house.