GbG is a joke of a system, but because it is played 24/7, that is the devs dream (players playing all the time), so they wont make any changes that will result in people playing less, more playtime more money for them. I've tried several tickets about the abusing of GbG but they were just "teaming up in GbG is not forbidden" and other cheap talk. But the only REMOVING SIEGE CAMPS can prevent that endless farm, big guilds already have more than resources, so destroying buildings is close to irrelevant.
That is the system now, for 1 year in a big guild you will outfarm people playing for 4-5 years but refusing to play with big guilds/leagues/sector swaps.