We like the boundary markers for guild bases. It creates an additional goal that players must work towards if they want to expand their base, and it helps to manage old structures so that we (the admins) don't have to clean up unnecessary structures around the map.
However, it would be nice to have a setting to disable the weekly upkeep costs. This would allow our players to take extended breaks from the game without worrying about their base decaying.
As an admin, I can still destroy boundary markers, should I need to force an entire base to start the decay process.