I as a EU player can easily log on with only 15 other players online and drain a town for money. Even if I lose money myself, I could easily do it just to damage the town I attack. Or it could work against EU players. Say i'm mayor of a EU town, we log off cuz it's late in EU. 10 min later 5 people from the 5 different LO (Using LO as example since you guys have a lot of towns) towns arrives and places down 5 outposts. When I log on next afternoon, my townbank has lost around 4K
Not really balanced.
The thing is, it doesn't really work. It can't be realistic because there are times no one will be on. When I am online after school, there are 15-20 people on from 1-3 different towns or the greylist world. I could easily abuse it for several hours.
The thing is, while that's a problem, the scaling for having multiple towns attacking one town should be pretty harsh
1.5x for 2 towns, 2x for 3 towns, 2.25 for 4 towns, 2.5 for 5 towns. So it costs you ton of money to start a war, and while you do damage, you're doing the same amount of damage, but to each of your own town banks. That's 5k on the other side, + outpost item costs for maybe 1k damage done to the town.
Since you guys are EU time, you can clear out the outposts when the attackers aren't on, so you do an additional 500 damage to each of the towns, and gain 250c from each.
You just made money from this attack.
I don't know if it's possible to adjust cooldowns on the fly, but reducing the cooldown on purge outpost scaling by the number of towns attacking should also be done. So more towns attacking means you have to cast more purge spells, but you can cast them since your cd is shorter