lol it's the mercs that must be raging they had to fight 30 vs 60 and they lost good gear.
No. When you sign onto someone else's battle, you use their equipment, not yours.
There is no cost for joining a neutral village battle. You use the village's equipment. In fact, even if it's 60 vs 10 you might as well join and just keep spawning to stop them from capping the last flag. Every time they have to kill you it will cost the village 1 ticket and more gear -- tickets and gear the attackers would have gotten for free, had they won without killing you!
If nothing else, I'm surprised the Great Troll Armada of cRPG doesn't do this, purely to make the attackers waste all those troops and gear.