For a base to be destroyed, it has to exist (see: defensemode 1 ore field POBs)
For a base to be maintained, it has to have some mechanical benefit to the owner. (see: Factory POBs)
For a base to be defended, it has to mechanically benefit other players. (see: Ore sale POBs right on top of a planet buying a different Ore)
The mechanical benefit BMM-Goldgeist offers is Gold Ore, cheap and fast. Unfortunately, so long as Canary Wharf and Isle of Skye exist and aren't charging extortionate rates for Gold Ore, its mechanical benefit loses its luster.