how? once its 3 weeks of sitting comes to an end that is it - no more sitting of said prov and why would a province with a legit player intentionally abandon his/her prov so his/her prov can get sat? what do you do with said player that's just abandoned his/her prov? move them into the prov that was initially being sat but is now the sitter? their IP would show up on both provs which could lead to deletions.
I am not against legitimate 'house shares' but that system was flawed.