The current mechanics for these are pointless and a waste of time to upgrade past 2/3.
The cost to maintain is not worth it on tier 3 and 4 due to a new guild being able to come in and setup a claim as close as possible then growing their claim and it pushes back the guilds monument that has been here forever, even a tier 4 monument. A tier 4 should not be pushed back by a tier lower than it. It makes it absolutely pointless now on green worlds to have tier 3/4 monuments.
Option 1: make all monuments (when maxed out still have growing affect so they can't be pushed back)
Option 2: make it where the higher tier monument will never be pushed back by a lower or equal monument.