If I'm not mistaken, I think I heard in the past that it was Yaba's goal to make all land owners, even if the player only owns a single common plot, to be happy and proud that he/she owns it.

Maybe in the near future, a common plot with a higher level building would be worth as much as a legendary plot with nothing on it. Gives the single plot owner incentive to keep building his land plot even if he has the most basic one.