I may be dumb but there should be a scientific explaination for these people behavior
They're a bunch of crybaby hypocrites
Scientific explanation is simple, there's no fear of retribution

they know they can execute low players that join mage fights, but low players can't execute them, so they bust in and leech from low levels starting GB's all the time.
As for the goal of winning such fights, you need what... 100 Great Battle leader for GB worship badge? If an enemy mage doesn't join, wiping out a dozen lv 6-10 and leeching on the low levels is an easy GB Leader win.