Land is similar, yes. Still one could get a 5-year lease and plan their business around it. AdWords rates can go up in price any minute, and if they don't they

Land is similar, yes. Still one could get a 5-year lease and plan their business around it. AdWords rates can go up in price any minute, and if they don't they create a false sense of security which is shattered when they finally do. Could they enable a new business? They could, but as soon as they enable two businesses of the same kind in one place they will also take all the profits from both.